In England, the scope for giving political power to a favourite was reduced by the growing importance of Parliament. After the "mushroom" Buckingham was assassinated by John Felton in 1628, Charles I turned to Thomas Wentworth, 1st Earl of Strafford, who had been a leader of Parliamentary opposition to Buckingham and the King, but had become his supporter after Charles made concessions. Strafford can therefore hardly be called a favourite in the usual sense even though his relationship with Charles became very close. He was also from a well-established family, with powerful relations. After several years in power, Strafford was impeached by a Parliament now very hostile to him. When that process failed, it passed a bill of attainder for his execution without trial, and it put enough pressure on Charles that to his subsequent regret, Charles signed it, and Strafford was executed in 1641. There were later minister-favourites in England, but they knew that the favour of the monarch alone was not sufficient to rule, and most also had careers in Parliament.