Final answer:
Thomas Wentworth, Earl of Strafford, was executed in May 1641, which was a significant event leading up to the English Civil War and marked a triumph for parliamentary power.
Step-by-step explanation:
The execution of Thomas Wentworth, Earl of Strafford, did indeed occur in May 1641. Strafford was a key advisor to King Charles I of England during the period leading up to the English Civil War. His policies were very unpopular with Parliament, and after a series of political maneuvers, he was eventually impeached and subsequently executed by beheading on May 12, 1641. The execution was seen as a victory for parliamentary authority over royal prerogative at the time.