Historical biography archive · Updated 2026-11-03

Thomas Seymour Biography and Timeline

Follow Thomas Seymour through 38 dated historical records for England.

Thomas Seymour, historical timeline

A chronological timeline drawn from matching World History Database records.

38Distinct records
1 of 1Page
1508–1549Years on this page

1508

Birth of Thomas Seymour

Baron · House / House of Seymour

Birth of Thomas Seymour, younger brother of the Protector Edward Seymour, son of Sir John Seymour

Birth of Thomas Seymour

Baron · Lord High Admiral · Wulfhall · House / House of Tudor

Thomas Seymour is born into the Seymour family and later becomes Lord High Admiral and husband of the widowed Queen Catherine Parr.

1543

Marshal in the Netherlands

Baron · Marshal of English Army · Netherlands · House / House of Seymour

Serves as marshal of English forces in the Netherlands.

Military Appointment

Baron · Marshal of English Army · Netherlands · House / House of Seymour

Takes a military role as England prepares for continental war.

Marshal

Baron · Marshal-English Armies · London · House / House of Seymour

Appointed Marshal of the English Armies in The Netherlands

1544

Admiral

Baron · Admiral of Fleet · London · House / House of Seymour

Appointed Admiral to the Fleet to guard the Channel

Ordinance

Baron · Master Ordnance · House / House of Seymour

Appointed Master of the Ordnance

1545

Succession

Baron · House / House of Seymour

Thomas schemed to marry either Princess Mary or Princess Elizabeth, Henry VIIIs daughters by his first two marriages, and there were rumours that he attempted to pursue a relationship with Elizabeth. Sees his brother Edward become Lord Protector of England and, in effect, ruler of the realm as Regent for his nephew, Henry VIIIs minor son and successor, the short-lived Edward VI

1547

Peerage

Baron · House / House of Seymour

Created Baron Seymour of Sudeley, part of an unfulfilled gifts clause left unmentioned in Henrys will

Marriage

Baron · London · House / House of Seymour

Thomas Seymour & Catherine Parr are betrothed

Succession

Baron · House / House of Seymour

Secret marriage to Catherine Parr, Elizabeth's guardian, is viewed as an attempt to become close to the young Princess. Acquires the guardianship of Elizabeth and also of Lady Jane Grey, another young member of the household

Marriage

Baron · London · House / House of Seymour

Marries Catherine Parr

Lord High Admiral

Baron · Lord High Admiral · Government / Government of England

Appointed Lord High Admiral

1548

Coup

Baron · Bristol · House / House of Seymour

Thomas Seymour hoped to finance a coup by bribing the vice-treasurer of the Bristol Mint, Sir William Sharington who was responsible for debasing the coinage in Bristol and he had been fiddling the account books and keeping the profits

Succession

Baron · Bristol · House / House of Seymour

When Catherine died in childbirth Thomas renewed his attentions to the Princess Elizabeth. Thomas Seymour hoped to finance a coup by bribing the vice-treasurer of the Bristol Mint, Sir William Sharington who was responsible for debasing the coinage in Bristol and he had been fiddling the account books and keeping the profits

Succession

Baron · Bristol · House / House of Seymour

By the end of 1548, Thomas plans had been reported to the Privy Council by an informant, the Bristol Mint is investigated and Sharington revealed all

Seymour Marriage Ambition

Baron · Lord High Admiral · London · House / House of Tudor

After Katherine Parr's death, Thomas Seymour renews plans to marry Princess Elizabeth, a match that could have given him exceptional influence over the Tudor succession.

Role range: 1508-1549 – 1547-1553

1549

Arrest of Thomas Seymour

Baron · House / House of Seymour

Thomas broke into the King's apartments at Hampton Court Palace, he entered the privy garden and awoke one of the King's pet spaniels.alerted by the dog, the guards arrested Thomas, and he was sent to the Tower of London

Plot

Baron · House / House of Seymour

Thomas broke into the King's apartments at Hampton Court Palace, he entered the privy garden and awoke one of the King's pet spaniels.alerted by the dog, the guards arrested Thomas, and he was sent to the Tower of London

Succession

Baron · House / House of Seymour

Thomas broke into the King's apartments at Hampton Court Palace, he entered the privy garden and awoke one of the King's pet spaniels.alerted by the dog, the guards arrested Thomas, and he was sent to the Tower of London

Arrest of Thomas Seymour

Baron · Admiral of Fleet · House / House of Seymour

An arrest order is made for Thomas Seymour

Attempted Access to Edward VI

Baron · Lord High Admiral · Hampton Court Palace · House / House of Tudor

Thomas Seymour enters the royal apartments at night during an alleged attempt to gain control of Edward VI, and the king's barking dog is shot.

Role range: 1508-1549 – 1547-1553

Thomas Seymour Arrested by the Council

Baron · Lord High Admiral · London · House / House of Tudor

Thomas Seymour is arrested after the council accuses him of unlawful political schemes involving the young king and Princess Elizabeth.

Arrest of Thomas Seymour

Baron · Tower of London · House / House of Seymour

Placed under arrest by his brother, Edward the Lord Protector. For scheming to marry Edward VI to Lady Jane Grey & himself to Pricess Elizabeth

Plot

Baron · London · House / House of Seymour

For scheming to marry Edward VI to Lady Jane Grey & himself to Pricess Elizabeth

Arrest of Thomas Seymour

Baron · Admiral of Fleet · Tower of London · House / House of Seymour

Seymour is arrested for fraud

Arrest of Thomas Seymour

Baron · House / House of Seymour

The Privy Council sent agents to question everyone associated with Thomas, including Princess Elizabeth, who by now was suspected of a sexual relationship with him and even of being pregnant with his child

Plot

Baron · House / House of Seymour

The Privy Council sent agents to question everyone associated with Thomas, including Princess Elizabeth, who by now was suspected of a sexual relationship with him and even of being pregnant with his child

Succession

Baron · House / House of Seymour

The Privy Council sent agents to question everyone associated with Thomas, including Princess Elizabeth, who by now was suspected of a sexual relationship with him and even of being pregnant with his child

Arrest of Thomas Seymour

Baron · Lord High Admiral · London · House / House of Tudor

The council arrests Thomas Seymour after the Hampton Court incident and investigates accusations that he intended to seize the king and advance his own power.

Role range: 1508-1549 – 1547-1553

Arrest of Thomas Seymour

Baron · House / House of Seymour

Charged by the Privy Council with thirty-three charges of treason

Plot

Baron · House / House of Seymour

Charged by the Privy Council with thirty-three charges of treason

Treason

Baron · House / House of Seymour

Charged by the Privy Council with thirty-three charges of treason

Trial

Baron · House / House of Seymour

Charged by the Privy Council with thirty-three charges of treason

Death of Thomas Seymour

Baron · Admiral of Fleet · Tower of London · House / House of Seymour

Death of Thomas Seymour, executed

Execution

Baron · Admiral of Fleet · Tower of London · House / House of Seymour

Seymour is executed for treason

Treason

Baron · Admiral of Fleet · Tower of London · House / House of Seymour

Seymour is executed for treason

Execution of Thomas Seymour

Baron · Lord High Admiral · Tower Hill · House / House of Tudor

Thomas Seymour is beheaded for treason after political manoeuvring against the Protectorate government of his brother Edward Seymour.

Role range: 1547-1549

Records, sources and methodology

These dates and descriptions come from the historical_events database. Exact duplicate records have been collapsed. Names are grouped by the country, Name 2 and Name 1 fields; records with missing Name 2 cannot be reliably assigned to an individual biography. Check the underlying sources before formal citation.