A cavalryman of some distinction, Selby began his military career at the tender age of 13. A younger son, he inherited neither money nor land from his father, in whose squadron of light horse he perhaps served in Scotland in 1560.
Following the reduction in size of the Berwick garrison, the office of gentleman porter was abolished, although in January 1605 the king authorized the continued payment of Selby’s pension.
A letter signed by ‘Sir William Selby’ was read to the Commons on 29 May 1607, but since it defended the actions of the border commissioners its author was clearly Selby’s nephew. There is no direct evidence that Selby attended the third session, but it seems unlikely that he absented himself as a bill to confirm his purchase of Ightham Mote received its first reading on 30 Mar. 1607. Selby’s reasons for introducing this piece of legislation are obscure, as neither the text of the bill nor a summary of its contents survive. However, the purchase of Ightham from Charles Allen (d.1592) was clearly problematic, for at the time Allen’s son and heir Stephen was a minor, and by law property which formed part of an entail could not be barred until the owner’s issue was of full age. To complicate matters, in 1584, prior to Selby’s purchase, Allen had leased Ightham for 21 years to Charles Paget, whose attainder in 1587 meant that the lease had been forfeited to the queen.
Selby evidently enjoyed a reputation among his fellow parliamentarians for strict accuracy in reporting, for in the notorious ‘Parliament Fart’ poem of 1607 he is depicted as demanding that the offending wind be reported ‘as ’twas spoken/ and then report till thy belly be broken’.
