At the moment the Queen died, the throne passed immediately and without ceremony to the heir, Charles, the former Prince of Wales.
But there are a number of practical - and traditional - steps which he must go through to be crowned King.
What will he be called?
He will be known as King Charles III.
That was the first decision of the new king's reign. He could have chosen from any of his four names - Charles Philip Arthur George.
He is not the only one who faces a change of title.
Although he is heir to the throne, Prince William will not automatically become Prince of Wales - that will have to be conferred on him by his father. He has inherited his father's title of Duke of Cornwall - William and Kate are now titled Duke and Duchess of Cornwall and Cambridge.
There is also a new title for Charles' wife, Camilla, who becomes the Queen Consort - consort is the term used for the spouse of the monarch.
It is expected that Charles will be officially proclaimed King on Saturday. This will happen at St James's Palace in London, in front of a ceremonial body known as the Accession Council.
This is made up of members of the Privy Council - a group of senior MPs, past and present, and peers - as well as some senior civil servants, Commonwealth high commissioners, and the Lord Mayor of London.
More than 700 people are entitled in theory to attend, but given the short notice, the actual number is likely to be far fewer. At the last Accession Council in 1952, about 200 attended.
At the meeting, the death of Queen Elizabeth will be announced by the Lord President of the Privy Council (currently Penny Mordaunt MP), and a proclamation will be read aloud.
The wording of the proclamation can change, but it has traditionally been a series of prayers and pledges, commending the previous monarch and pledging support for the new one.
This proclamation is then signed by a number of senior figures including the prime minister, the Archbishop of Canterbury, and the Lord Chancellor.
As with all these ceremonies, there will be attention paid to what might have been altered, added or updated, as a sign of a new era.
The King's first declaration
The King attends a second meeting of the Accession Council, along with the Privy Council. This is not a "swearing in" at the start of a British monarch's reign, in the style of some other heads of state, such as the President of the US. Instead there is a declaration made by the new King and - in line with a tradition dating from the early 18th Century - he will make an oath to preserve the Church of Scotland.
After a fanfare of trumpeters, a public proclamation will be made declaring Charles as the new King. This will be made from a balcony above Friary Court in St James's Palace, by an official known as the Garter King of Arms.
He will call: "God save the King", and for the first time since 1952, the national anthem will be played with the words "God Save the King".
Gun salutes will be fired in Hyde Park, the Tower of London and from naval ships, and the proclamation announcing Charles as the King will be read in in Edinburgh, Cardiff and Belfast.
The symbolic high point of the accession will be the coronation, when Charles is formally crowned. Because of the preparation needed, the coronation is not likely to happen very soon after Charles's accession - Queen Elizabeth succeeded to the throne in February 1952, but was not crowned until June 1953.
For the past 900 years the coronation has been held in Westminster Abbey - William the Conqueror was the first monarch to be crowned there, and Charles will be the 40th.
It is an Anglican religious service, carried out by the Archbishop of Canterbury. At the climax of the ceremony, he will place St Edward's Crown on Charles's head - a solid gold crown, dating from 1661.
This is the centrepiece of the Crown Jewels at the Tower of London, and is only worn by the monarch at the moment of coronation itself (not least because it weighs a hefty 2.23kg - almost 5lbs).
Unlike royal weddings, the coronation is a state occasion - the government pays for it, and ultimately decides the guest list.
There will be music, readings and the ritual of anointing the new monarch, using oils of orange, roses, cinnamon, musk and ambergris.
The new King will take the coronation oath in front of the watching world. During this elaborate ceremony he will receive the orb and sceptre as symbols of his new role and the Archbishop of Canterbury will place the solid gold crown on his head.
Head of the Commonwealth
Charles has become head of the Commonwealth, an association of 56 independent countries and 2.4 billion people. For 14 of these countries, as well as the UK, the King is head of state.
These countries, known as the Commonwealth realms, are: Australia, Antigua and Barbuda, the Bahamas, Belize, Canada, Grenada, Jamaica, Papua New Guinea, St Christopher and Nevis, St Lucia, St Vincent and the Grenadines, New Zealand, Solomon Islands, Tuvalu.
More than a dozen people were killed in a 5.6-magnitude quake that rattled Indonesia's West Java province on Monday, a local official said.
Herman Suherman, a government official from Cianjur, the town in West Java where the epicentre of the quake was located, told news channel MetroTV that up to 20 people had died at one hospital in the area.
The epicentre was on land in Cianjur in West Java, about 75 km southeast of Jakarta, and at a depth of 10 km (6.2 miles), BMKG said, adding there was no potential for a tsunami.
Some people evacuated offices in the central business district of Jakarta, while others reported feeling buildings shake and seeing furniture move, Reuters witnesses said.
Muchlis, who was in Cianjur when the quake hit, said he felt "a huge tremor" and the walls and ceiling of his office building were damaged.
"I was very shocked. I worried there will be another quake," Muchlis told the Metro TV news channel, adding that people ran out of their houses, some fainting and vomiting because of the strong tremors.
BMKG chief Dwikorita Karnawati, speaking to reporters at parliamentary building, advised people to stay outdoors in case of aftershocks.
Suko Prayitno Adi of the BMKG said authorities were checking the extent of the damage caused by the quake.
The United States Geological Survey (USGS) recorded the earthquake at a magnitude of 5.4 on the Richter scale.
Turkey launched airstrikes over several towns in northern Syria on Saturday, U.S.-backed Kurdish-led forces reported.
The airstrikes occurred a week after a bomb rocked a bustling avenue in the heart of Istanbul, killing six people and wounding over 80 others. Turkish authorities blamed the attack on the outlawed Kurdistan Workers’ Party, or PKK, as well as Syrian Kurdish groups affiliated with it. The Kurdish militant groups have, however, denied involvement.
Ankara and Washington both consider the PKK a terror group, but disagree on the status of the Syrian Kurdish groups, which have been allied with the U.S. in the fight against the Islamic State group in Syria.
Following the strikes, the Turkish ministry of defense posted a photo of a fighter plane with the phrase, “The treacherous attacks of the scoundrels are being held to account."
The airstrikes targeted Kobani, a strategic town near the Turkish border that Ankara had previously attempted to overtake in its plans to establish a “safe zone” along northern Syria. SDF spokesperson Farhad Shami in a tweet added that two villages heavily populated with displaced people were under Turkish bombardment. He said the strikes had resulted in “deaths and injuries.”
Syrian opposition media reported that Turkish airstrikes targeted Kurdish-led Syrian Democratic Forces positions.
The Britain-based Syrian Observatory for Human Rights, an opposition war monitor, reported that the strikes had also hit Syrian army positions and that at least 12 had been killed, including both SDF and Syrian army soldiers.
The observatory said about 25 air strikes were carried out by Turkish warplanes on sites in the countryside of Aleppo, Raqqa and Hasakah.
The Kurdish-led authority in northeast Syria said Saturday that if Turkey attacks, then fighters in the area would have “the right to resist and defend our areas in a major way that will take the region into a long war.”
Turkey has launched three major cross-border operations into Syria since 2016 and already controls some territories in the north.
Investigators have found traces of explosives at the site of the damaged Nord Stream gas pipelines, confirming sabotage had taken place, a Swedish prosecutor said on Friday.
Swedish and Danish authorities are investigating four holes in the Nord Stream 1 and 2 pipelines which link Russia and Germany via the Baltic Sea and have become a flashpoint in the Ukraine crisis as gas supplies in Europe run short.
Denmark last month said a preliminary investigation had shown that the leaks were caused by powerful explosions.
"Analysis that has now been carried out shows traces of explosives on several of the objects that were recovered," the Swedish Prosecution Authority said in a statement, adding that the findings establish the incident as "gross sabotage".
It said the continued probe would determine whether it would be possible to identify those responsible.
Cooperation with authorities in Sweden as well as in other countries was going very well, lead prosecutor Mats Ljungqvist said.
The prosecutor's office declined to give further comment, including on which explosives were believed to have been used to damage the pipelines.
Russia will wait until a full damage assessment is done before deciding on repairs, if any, Kremlin spokesman Dmitry Peskov said on Friday.
"The very fact that data has already begun to come in, in favour of confirming a subversive act or a terrorist act... once again confirms the information that the Russian side has," Peskov told his daily call with reporters.
"It is very important not to stop, it is very important to find the one behind this explosion."
Neither Gazprom, nor the Nord Stream 1 and 2 replied to Reuters requests for comment.
Seismologists in Denmark and Sweden previously said they had registered tremors in the immediate vicinity of the leaks and that the signals did not resemble those from earthquakes.
Danish police declined to comment on the Swedish findings.
The 26 Sept ruptures of the seabed pipelines, spewing gas into the ocean that bubbled to the surface in the week that followed, triggered warnings of public hazard and fears of environmental damage.
A section measuring at least 50 metres (164 feet) is missing from Nord Stream 1, Swedish daily Expressen reported on 18 Oct after filming what it said were the first publicly released images of the damage.
Russia's defence ministry last month said that British navy personnel blew up the pipelines, a claim that London said was false and designed to distract from Russian military failures in Ukraine.
A shooting that sent four people to hospital and another gun-related incident forced thousands of students at two Montreal area colleges to go into lockdown on Friday.
At 5:30 pm local time (2230 GMT), gunshots rang out at a park across the street from Montmorency College in the Montreal suburb of Laval, police spokeswoman Genevieve Major told AFP.
Four people who had been shot sought refuge at the college and were later taken to hospital with non-life-threatening injuries.
The college, which is attended by nearly 10,000 students and faculty, remained locked down into the evening as police swarmed the area in search of the shooter.
Mayor Stephane Boyer tweeted that a police operation was "underway", while television footage showed parents of students crowding the roads around the college after they rushed to the scene.
Earlier, a 19-year-old man wearing a bulletproof vest was arrested at a junior college 40 kilometers (25 miles) south of Montreal and charged with allegedly uttering threats.
Students and staff at the Cegep Saint-Jean-sur-Richelieu told local media they were ordered to barricade themselves in classrooms and turn off the lights for most of the day, while a police operation unfolded outside.
"At the beginning we were very scared," student Alejandra Montequin told Canadian broadcaster Global News. "It was very tense; people were talking to their parents."
Quebec Public Security Minister Francois Bonnardel said in a Twitter post that the students in Saint-Jean-sur-Richelieu had "experienced a difficult situation today."
"I'm relieved at the turn of events," he said, adding that he would wait for the results of the police investigation "to fully understand what happened."
Jubilant residents welcomed Ukrainian troops arriving in the centre of the strategic city of Kherson after Russia abandoned the only regional capital it had captured since its invasion began in February.
President Zelenskiy hailed "a historic day" in getting Kherson back. Special units of the military were inside with defending troops on the outskirts, he said.
Russia's defence ministry said it had withdrawn more than 30,000 soldiers across the Dnipro River in its retreat, without losing a soldier. But Ukrainians described a chaotic retreat, with Russian troops ditching their uniforms or drowning trying to escape.
The Kremlin said Russia's withdrawal from Kherson's capital would not change the region's status as annexed by Russia.
Significant new damage to the major Nova Kakhovka dam in southern Ukraine can be seen following Russia's withdrawal from nearby Kherson, US satellite imagery company Maxar said.
Ukraine's Foreign Minister Dmytro Kuleba, at an Asian summit in Cambodia, on Saturday urged Southeast Asian countries to take all measures possible to stop Russia from playing "hunger games" over a Black Sea grain deal that could expire next week.
Ukraine says it is building a reinforced concrete wall and other fortifications on its border with Belarus, a Kremlin ally that Moscow used as a staging ground for its 24 Feb invasion.
The United Nations nuclear watchdog said an investigation of a research plant in the Ukrainian city of Kharkiv found it was badly damaged, but there were no signs of a radiological release or diversion of nuclear material.
Senior UN officials met with a Russian delegation in Geneva to discuss Moscow's grievances about the Black Sea grains export initiative and address the need for unimpeded food and fertilizer exports, a UN spokesperson said.
Russian-based international ballet dancers from elite companies like the Bolshoi and the Mariinsky who fled the country, leaving behind their lives, jobs and belongings, are reuniting for one performance in California on Saturday.
More than a dozen people were killed in a 5.6-magnitude quake that rattled Indonesia's West Java province on Monday, a local official said. Herman Suherman, a government official from Cianjur, the town in West Java where the epicentre of the quake was located, told news channel MetroTV that up to 20 people had died at one hospital in the area.
Turkey launched airstrikes over several towns in northern Syria on Saturday, U.S.-backed Kurdish-led forces reported. The airstrikes occurred a week after a bomb rocked a bustling avenue in the heart of Istanbul, killing six people and wounding over 80 others. Turkish authorities blamed the attack on the outlawed Kurdistan Workers’ Party, or PKK, as well as Syrian Kurdish groups affiliated with it. The Kurdish militant groups have, however, denied involvement.
Investigators have found traces of explosives at the site of the damaged Nord Stream gas pipelines, confirming sabotage had taken place, a Swedish prosecutor said on Friday. Swedish and Danish authorities are investigating four holes in the Nord Stream 1 and 2 pipelines which link Russia and Germany via the Baltic Sea and have become a flashpoint in the Ukraine crisis as gas supplies in Europe run short.
A shooting that sent four people to hospital and another gun-related incident forced thousands of students at two Montreal area colleges to go into lockdown on Friday. At 5:30 pm local time (2230 GMT), gunshots rang out at a park across the street from Montmorency College in the Montreal suburb of Laval, police spokeswoman Genevieve Major told AFP.