Compton was the younger son of Henry, 1st Lord Compton, and consequently the uncle of Spencer Compton*. He was the only son of his father’s second marriage and was heir to an estate that had been settled at his parents’ wedding. On the death of his father in 1589, Compton, still a minor, became a ward of the Crown. His mother purchased the wardship for £100, and in 1592 married Robert Sackville*, the eldest son of lord treasurer Buckhurst (Thomas Sackville†), subsequently 1st earl of Dorset.
Compton was appointed to nine committees in the first Jacobean Parliament, all but one in the opening session. He made no recorded speeches. He was among those appointed to consider bills to preserve woodland (28 Apr.), punish vagrants (5 May), and confirm the charter of Bridewell Hospital (9 June).
Early in 1613 Compton accompanied his brother-in-law, (Sir) Edward Sackville*, to fight with Lord Bruce of Kinloss ‘on Calais sands’, but he was not present at their final and fatal encounter later in the year.
Compton purchased Brambletye in 1619 and was re-elected to Parliament in early 1621, when he was appointed to consider two bills, one for wool carding (10 Mar.) and the other to establish a new trust for a Sackville connection, Anthony, 2nd Viscount Montagu (15 Mar.).
In the summer of 1624 Compton was appointed a Sussex justice of the peace and deputy lieutenant, possibly thanks to Sir Edward Sackville, who succeeded as 4th earl of Dorset in March of that year and was subsequently appointed one of the lord lieutenants of the county. Compton may have been particularly important to Sackville because of his connection with Buckingham. When Dorset drafted his will in 1625 he named Compton one of his executors, and it was presumably the former who appointed Compton ranger of Ashdown forest, as the forest formed part of the honour of Eagle, of which the earl was steward.
Within less than a year of the death of his first wife Compton married another recusant, who brought him property in Norfolk. When the first Caroline Parliament was summoned he was again returned for East Grinstead, but neither then nor in 1626 and 1628, when he was re-elected, did he leave any trace of his presence on the records. On 2 June 1626 he was recorded as absent without excuse.
Compton entered into his Common Pleas office in 1630, then worth some £2,000 p.a., and he may have applied the profits to building a new house at Brambletye in ‘Jacobean Gothic’.
