Henry VII of England

Henry VII (28 January 1457 – 21 April 1509) was King of England and Lord of Ireland after he seized the crown on 22 August 1485 until his death on 21 April 1509, as the first monarch of the House of Tudor.

Power Seizure
Henry won the throne when he defeated Richard III at the Battle of Bosworth Field. He was the last king of England to win his throne on the field of battle. He was successful in restoring the power and stability of the English monarchy after the political upheavals of the Wars of the Roses.

Working with the Assassins
The Assassins offered to kill Margaret of York for King Henry, and he accepted their offer. They succeeded and found out that the Templars had infiltrated the Star Chamber, England's secret court. Eventually, Ezio Auditore's apprentices found out which members of the Chamber worked for the Templars and reported their identities to the king. Grateful for their services, Henry kept one seat open for the Assassin Brotherhood.

End of his Reign
At the end of his reign, Henry founded a long-lasting dynasty and was peacefully succeeded by his son, Henry VIII, after a reign of 23 years.

Source

 * Assassin's Creed: Brotherhood