Of obscure background, Forster is first recorded as residing at Bray in March 1445, when he witnessed a deed there in association with the highly influential courtier, John Norris*.
Quite likely a lawyer by training, the MP may have been the man of this name appointed during the second session of the Parliament of 1453 as clerk to the justice of the forests south of the Trent, for term of his life.
Described as an esquire, Forster witnessed a transaction regarding land in Binfield in February 1462,
A pardon granted to Forster in May 1458 had referred to him as ‘of Houghton, Sussex, esquire, late of Binfield, Berkshire, gentleman’,
Forster relinquished his stewardship of Bray before November 1465,
