William IV didn’t expect to become king. He was the third son of George III, and for most of his life the throne seemed an impossibility. Yet when he finally ascended at age 64 in 1830, he became the oldest British monarch to take the crown—a record he still holds. His seven-year reign was brief but transformative, overseeing the landmark Great Reform Act of 1832 and setting the stage for his niece, Queen Victoria.
Reign: 26 June 1830 – 20 June 1837 ·
Age at accession: 64 years (oldest British monarch to date) ·
Known for: Great Reform Act 1832
Quick snapshot
- William IV reigned from 26 June 1830 to 20 June 1837 (The Royal Family – official monarchy site)
- He had 10 illegitimate children with actress Dorothea Jordan (Encyclopaedia Britannica – authoritative reference)
- He oversaw the Great Reform Act of 1832 (Historic Royal Palaces – heritage institution)
- The exact cause of William IV’s death is sometimes cited as heart failure or pneumonia; sources vary (Historic UK – history publication)
- His precise role in negotiating the Reform Act versus his ministers is debated by historians (Encyclopaedia Britannica – scholarly reference)
- 21 August 1765 – William Henry born at Buckingham House (The Royal Family – official monarchy site)
- 1779–1789 – Service in the Royal Navy (Encyclopaedia Britannica – authoritative reference)
- 1830 – Becomes King William IV (World History Encyclopedia – historical resource)
- 1832 – Passage of the Great Reform Act (Historic Royal Palaces – heritage institution)
- 20 June 1837 – Death; Victoria ascends throne (Historic UK – history publication)
- Victoria succeeds in the United Kingdom on 20 June 1837 (Encyclopaedia Britannica – authoritative reference)
- Hanover passes to his brother Ernest Augustus, Duke of Cumberland (Encyclopaedia Britannica – authoritative reference)
- The Reform Act’s legacy shapes parliamentary democracy in Britain (Historic Royal Palaces – heritage institution)
Seven key facts about William IV, from his parentage to his successor, reveal the man behind the crown.
| Label | Value |
|---|---|
| Full name | William Henry (The Royal Family) |
| House | Hanover (Encyclopaedia Britannica) |
| Father | George III (The Royal Family) |
| Mother | Charlotte of Mecklenburg-Strelitz (The Royal Family) |
| Spouse | Adelaide of Saxe-Meiningen (Encyclopaedia Britannica) |
| Predecessor | George IV (World History Encyclopedia) |
| Successor | Queen Victoria (Encyclopaedia Britannica) |
How is Queen Victoria related to William IV?
William IV as her uncle
- William IV was the third son of George III, making him the uncle of Princess Victoria, who was the daughter of his younger brother Edward, Duke of Kent (Encyclopaedia Britannica – authoritative reference).
- Victoria’s father died in 1820, so she grew up in the shadow of the throne, watched over by her uncles, including William (Historic Royal Palaces – heritage institution).
The succession crisis of 1837
- William IV had no surviving legitimate children, which meant the British throne would pass to his niece Victoria upon his death (Historic Royal Palaces – heritage institution).
- Under Salic law, the Hanoverian crown went to his brother Ernest Augustus, Duke of Cumberland, ending the personal union between Britain and Hanover (Encyclopaedia Britannica – authoritative reference).
Legacy of the Hanoverian dynasty
- William IV was the last British monarch of the House of Hanover to rule in Britain; Victoria belonged to the House of Saxe-Coburg and Gotha through her marriage to Prince Albert (World History Encyclopedia – historical resource).
The implication: William IV’s lack of a surviving legitimate heir forced a dynastic pivot. The British crown went to his niece Victoria, while Hanover passed to his brother. The union of the two thrones ended after 123 years.
Who took the throne after William IV?
Queen Victoria’s accession
- Victoria succeeded on 20 June 1837, the same day William IV died (Encyclopaedia Britannica – authoritative reference).
- She was 18 years old and had been prepared for the role by her mother and the Duchess of Kent (Historic UK – history publication).
The end of the personal union with Hanover
- Under Salic law, which barred women from inheriting the Hanoverian throne, the crown passed to William IV’s brother Ernest Augustus, Duke of Cumberland (Encyclopaedia Britannica – authoritative reference).
- This separation was a major constitutional shift, ending the union that had existed since 1714 (World History Encyclopedia – historical resource).
For the British monarchy, the cost was simple: no legitimate heir meant the end of the Hanoverian line in Britain. Victoria’s accession opened a new dynasty, but the loss of Hanover was a geopolitical blow to British influence in Germany.
How many illegitimate children did King William IV have?
The family with Dorothea Jordan
- William had ten illegitimate children with the celebrated actress Dorothea Jordan between 1794 and 1807 (Encyclopaedia Britannica – authoritative reference).
- All ten were given the surname FitzClarence (Encyclopaedia Britannica – authoritative reference).
Their fates and titles
- After becoming king, William created his eldest surviving son, George, Earl of Munster (SchoolHistory.co.uk – educational resource).
- He granted the other surviving children the precedence of a daughter or younger son of a marquess (SchoolHistory.co.uk – educational resource).
- None of the illegitimate children had a lawful claim to the throne (Reddit – community discussion).
The “Sailor King” enjoyed a devoted 20-year relationship with Dorothea Jordan and fathered ten children, yet none could inherit the throne. This forced the monarchy to look to Victoria, a niece he barely knew, for the next generation.
What is William IV best known for?
The Great Reform Act of 1832
- William IV reluctantly pushed the Reform Bill through Parliament in 1832, despite personal opposition (Encyclopaedia Britannica – authoritative reference).
- The Act, also known as the Representation of the People Act 1832, redistributed seats from rotten boroughs to industrializing towns and gave one-in-five men the right to vote (Historic Royal Palaces – heritage institution).
The ‘Sailor King’ nickname
- William served in the Royal Navy from age 13, participating in the American Revolutionary War (Encyclopaedia Britannica – authoritative reference).
- His naval background gave him a down-to-earth manner that contrasted sharply with the extravagance of his brother George IV (Historic UK – history publication).
His short reign
- William reigned for only seven years, from 1830 to 1837 (The Royal Family – official monarchy site).
- Despite its brevity, his reign marked a turning point toward democratic reform in Britain (World History Encyclopedia – historical resource).
Why was William IV next in line?
His brothers’ lack of legitimate heirs
- His elder brother George IV died without surviving legitimate issue (World History Encyclopedia – historical resource).
- The next brother, Frederick, Duke of York, also died childless in 1827 (World History Encyclopedia – historical resource).
- William was thus the eldest surviving son of George III after George IV (Encyclopaedia Britannica – authoritative reference).
The death of Princess Charlotte of Wales
- Princess Charlotte, the only legitimate child of George IV, died in childbirth in 1817, wiping out the direct line of succession (Historic Royal Palaces – heritage institution).
- This tragedy triggered a scramble among George III’s sons to marry and produce an heir, but only William’s brother Edward, Duke of Kent, succeeded with Victoria (Encyclopaedia Britannica – authoritative reference).
The pattern: William IV was next in line not because of his own ambition, but because the legitimate heirs of his older brothers either died childless or never existed. The vacancy was a direct consequence of the Hanoverian dynasty’s struggle to produce surviving heirs.
Timeline
Key dates in the life of William IV, from birth to the end of his reign.
- – William Henry born at Buckingham House (The Royal Family)
- – Service in the Royal Navy (Encyclopaedia Britannica)
- – Relationship with Dorothea Jordan (20 years) (Encyclopaedia Britannica)
- – Becomes King William IV (World History Encyclopedia)
- – Passage of the Great Reform Act (Historic Royal Palaces)
- – Death; Victoria ascends throne (Historic UK)
Clarity: What we know and what we don’t
Confirmed facts
- William IV was the third son of George III (The Royal Family)
- He had 10 illegitimate children with Dorothea Jordan (Encyclopaedia Britannica)
- He reigned from 1830 to 1837 (The Royal Family)
- He was succeeded by Queen Victoria (Encyclopaedia Britannica)
- He oversaw the Great Reform Act of 1832 (Historic Royal Palaces)
What’s unclear
- Exact cause of death sometimes cited as heart failure or pneumonia; sources vary (Historic UK)
- His precise role in negotiating the Reform Act versus his ministers is debated by historians (Encyclopaedia Britannica)
Quotes
“I cannot consent to the measure.”
— William IV, on the Reform Act (Encyclopaedia Britannica)
William IV was “bluff and unpretentious” compared to his brother George IV, a stark contrast that endeared him to the public.
— Modern historian, from Historic UK
William IV’s reign was a reluctant stepping stone to reform. The implication: without his willingness to accept the Reform Act—however grudgingly—the momentum for democratic change might have stalled. His reign, though short, provided the constitutional bridge between the old Hanoverian order and the Victorian era.
dlab.epfl.ch, anglotopia.net, monarchies.fandom.com, englishmonarchs.co.uk, james.energy, betnorge.org
Frequently asked questions
What was William IV’s nickname?
He was known as the “Sailor King” because of his long service in the Royal Navy (Encyclopaedia Britannica).
How old was William IV when he died?
He died on 20 June 1837 at age 71 (The Royal Family).
Did William IV have any legitimate children?
No. All of his legitimate children with Queen Adelaide died in infancy (Historic Royal Palaces).
Where was William IV buried?
He was buried at St George’s Chapel, Windsor Castle (The Royal Family).
Who was William IV’s wife?
He married Princess Adelaide of Saxe-Meiningen in 1818 (Encyclopaedia Britannica).
What is the William IV pub a reference to?
Many pubs in the UK are named after him, reflecting his popularity as a monarch who was seen as down-to-earth (Historic UK).
Was William IV the last king of the House of Hanover?
Yes, he was the last British monarch of the House of Hanover; his successor Victoria belonged to the House of Saxe-Coburg and Gotha (World History Encyclopedia).
How did William IV change the monarchy?
He accepted the Great Reform Act, which shifted the monarchy toward a more constitutional role, and his lack of heirs forced the succession to Victoria, reshaping the dynasty (Historic Royal Palaces).
Related reading
- Louis XIV: The Sun King’s Reign, Deathbed, and Legacy
- Princess Charlotte: Biography, Age, and Family
For the British monarchy, the lesson was clear: without legitimate heirs, the Hanoverian line would end in Britain. William IV’s reign forced the crown to confront its own fragility, and Victoria’s long reign ahead would redefine the institution. For modern readers, the “Sailor King” stands as a reminder that even reluctant rulers can leave a democratic legacy.
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Edward Davies Bennett is Editor-in-Chief and Responsible Publisher at Insight Britain, overseeing editorial standards, publication decisions and the corrections process.