Percy was descended from William de Percy, who probably took his name from Percy-en-Auge, in Calvados, Normandy. He came to England shortly after the Conquest, becoming an important Yorkshire baron before his death on the First Crusade.
Percy’s father secured the place of captain of the band of gentleman pensioners at the accession of James and a place on the Privy Council, but he unwisely admitted his kinsman, the gunpowder plotter Sir Thomas Percy, to the band without first requiring him to take the Oath of Supremacy, and consequently spent 16 years in the Tower, where his taste for chemical experiments earned him the sobriquet of ‘the Wizard Earl’. During this period of enforced inactivity he doubled his rent-roll to nearly £13,000 p.a., and applied himself to the education of his heir ‘to wean him from his nursery company and his mother’s wings’ at an early age. From 1608 Percy spent considerable time in the Tower with his father and may have fallen under the influence of another prisoner, Sir Walter Ralegh†. When he left the Tower for Cambridge in 1615, Northumberland thought him ‘raw and behind many of his age’, and drew his tutor’s attention to his bashfulness, ‘partly to be excused in him, for all our name are subject rather to few words than to much babbling’. The backwardness was curable, Northumberland himself admitting that by 1618 Percy had ‘a piece of the scholar’ and would readily ‘gain the tongues’ on travelling in Europe under the conduct of Edward Dowse*.
Northumberland was released as part of a general amnesty for political prisoners in the summer of 1621 and Percy, having come of age two years later, was returned for Sussex in 1624.
After the end of that Parliament Percy joined his brother-in-law, James Hay, 1st earl of Carlisle, and his cousin Viscount Kensington (Henry Rich*) in France, where they were negotiating Prince Charles’s marriage, and returned in the autumn, ‘with good news as is presumed’, reported Chamberlain, ‘else would they not make him the messenger’.
Re-elected for Chichester in 1626, Percy was appointed to four committees. He was instructed to attend the conferences with the Lords on the Commons’ invitation to Buckingham to explain the renewed detention of the St. Peter (4 Mar.), and on matters of defence (8 March). He was also appointed, on 25 Mar., to consider the bill ‘for the making of the arms of the kingdom more serviceable’.
By 1633 Percy had succeeded to his father’s title and had returned to Westminster, being described by Carlisle in March of that year as ‘one of the honestest, discreetest, and ablest young lords about the Court’. He rose rapidly in the 1630s, despite chronic ill health, becoming a privy councillor and lord admiral.
