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Upon the death of Queen Elizabeth II on Sept. 8, her son King Charles III immediately ascended the throne. Buckingham Palace announced Thursday the longest-reigning monarch had died at Balmoral Castle surrounded by members of the royal family.

The announcement was made shortly after the queen had been placed under medical supervision after her doctors became "concerned" for her health earlier that day.

The queen's death brought about an immediate and historic change in titles and roles within the royal family. Prince Charles, now King Charles III's, heir to the throne is his eldest son, Prince William.

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Line of succession for the British throne:

The succession to the British throne "is regulated not only through descent but also by Parliamentary statute," according to the royal family’s website.

Here’s a look at who currently is in line for the throne after Queen Elizabeth II, who is 96 years old.

1. The Prince of Wales

Prince William and Kate Middleton

Prince William is the oldest son of Charles, Prince of Wales. (Reuters/Yves Herman)

Prince William, the Prince of Wales, is the oldest son of Charles. The 40-year-old is first in line to the throne. He married Kate Middleton in 2011.

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William and Catherine "Kate" Middleton, who were named the Prince and Princess of Wales by King Charles III on Friday, were previously known as the Duke and Duchess of Cambridge.

2. Prince George of Wales

Prince George

Prince George smiles in a birthday portrait taken by mother. (The Duke and Duchess of Cambridge Twitter)

At only 9 years old, Prince George of Cambridge is second in line of succession to the British throne. He is the oldest child of Prince William.

4. Princess Charlotte of Wales

Princess Charlotte

Britain's William and Kate shared a photo of their daughter Princess Charlotte to mark her seventh birthday. (Twitter/@KensingtonRoyal)

Princess Charlotte of Wales is the second child of Prince William and Princess Kate. She is 7 years old.

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5. Prince Louis Arthur Charles of Wales

Prince Louis riding his red bike in a blue sweater

In this handout photo provided by the Princess of Wales, Britain's Prince Louis smiles before his first day of attending Willcocks Nursery School, at Kensington Palace in London, Wednesday, April 21, 2021.  (Duchess of Cambridge via AP)

Prince William and Princess Catherine welcomed their third child, a boy, on April 23, 2018. The four-year-old is fourth in line to the throne.

He was named after William's grandfather, King Charles III, and the Duke's mentor -- Louis Mountbatten -- who was killed by a bomb in 1979.

6. Prince Harry, Duke of Sussex

Prince Harry and Meghan Markle

Britain's Prince Harry and his wife Meghan Markle. He is fifth in line to the throne. (Reuters/Toby Melville)

Prince Harry is the sixth in line to the throne. He is the younger son of Charles, the Prince of Wales.

7. Archie Harrison Mountbatten-Windsor

Prince Harry, Meghan Markle, with son Archie

Harry and Meghan sit with Archie during their Cape Town, South African tour. (Getty)

Prince Harry and Meghan welcomed their first child, a boy, on May 6, 2019. They named him Archie, and the three-year-old is sixth in line to the throne— behind his dad.

He is Queen Elizabeth II's eighth great-grandchild and the younger cousin of Prince George, Princess Charlotte and Prince Louis.

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8. Lilibet Diana Mountbatten-Windsor

Prince Harry, Meghan Markle daughter Lilibet

Meghan Markle and Prince Harry revealed daughter Lilibet's first photo on her birthday. (Misan Harriman)

Miss Lilibet Mountbatten-Windsor, 1, is seventh in line to the throne, behind her older brother.

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9. Duke of York

Prince Andrew

Prince Andrew is the third child of Queen Elizabeth II and her second son. (Reuters/Neil Hall)

Prince Andrew, the Duke of York, is Queen Elizabeth II’s third child and second son. The 62-year-old is eigth in line of succession to the British throne.

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10. Princess Beatrice of York

Princess Beatrice

Princes Beatrice is Prince Andrew's oldest daughter. (Reuters/Toby Melville)

Princess Beatrice of York is Prince Andrew’s oldest daughter. She is 34 years old.