His father died in 1517 when William was aged 4 and he became a
ward of King Henry VIII, from whom his mother re-purchased his marriage, at great expense. Parr took part in suppressing the rising in the North of England in 1537, when he attracted the favourable notice of
Thomas Howard, 3rd Duke of Norfolk (uncle of both
Anne Boleyn and
Katherine Howard), encouraging his uncle Sir
William Parr (c.1483–1547) of Horton, Northamptonshire, to obtain a place for him as a courtier in the King's
Privy Chamber. After serving as a
Member of Parliament for
Northamptonshire he was created Baron Parr ("of Kendal") in 1539. On 23 April 1543, he became a Knight of the Garter. On 23 December 1543, just after his sister had married the king, he was created
Earl of Essex, a title held by his late father-in-law
Henry Bourchier, 2nd Earl of Essex, who had died without male issue in March 1540. In 1544 he joined the
Privy Council attending the first meeting on 5 February 1544. He was King
Edward VI's "beloved uncle" (in fact step-uncle, being the brother of that king's step-mother) and one of the most important men at Edward's court, and the leader of the Protestant party, especially during the time of
John Dudley, 1st Duke of Northumberland's time as leader of the government. Parr served as
Lord Lieutenant in 1549 of five of the eastern counties (Cambridgeshire, Huntingdonshire, Bedfordshire, Northamptonshire and Norfolk), of Surrey in 1551, of Berkshire and Oxfordshire in 1552 and of Hertfordshire and Buckinghamshire in 1553. He served as
Lord Great Chamberlain from 1550 to 1553, in which role in 1551 he welcomed
Mary of Guise, Regent of Scotland, to
Hampton Court Palace on behalf of the King. Parr, and especially his wife, were leaders in the attempt to put the Protestant
Lady Jane Grey (daughter-in-law of Northumberland) on the throne after Edward's death (as that king had desired) in place of the other contender his half-sister the Roman Catholic Queen Mary. However his attempt failed and after the accession of
Mary I in 1553 he was convicted of
high treason, was
attainted and sentenced to death on 18 August 1553. However he was released within a few months and following the accession of the Protestant Queen
Elizabeth I, his titles were restored in 1559. He became a Knight of the Garter again on 24 April 1559. ==Marriages==