English knight, son of Sir William Tyrrell and Margaret Darcy. He came to prominence during the Wars of the Roses as a supporter of the Yorkist cause, for which he was knighted in 1471 when Edward IV gained the throne for the second time. After Edward's death he became a loyal adherent to his brother Richard III, but was in France at the time of the Battle of Bosworth when Henry Tudor became king. Upon his return to England the following year, he received a pardon from the new monarch and was appointed Governor of Guisnes. However, in 1501 while abroad he became linked with the plot of Yorkist claimant Edmund de la Pole to claim the throne. Tyrrell was recalled on charges of treason and tortured. His startling confession, written about by Sir Thomas More, implicated him in the murder of the Princes In The Tower, a revelation that has kept scholars busy ever since - especially as no record of the confession now exists. He was beheaded at Tower Hill on May 6, 1502, and buried at the Austin Friars church (where many of his fellow Yorkist knights were buried after the Battle of Barnet).