Although the Forsters were one of the principal families of the borough of Shrewsbury, their pedigree is difficult to disentangle. Three Williams played a prominent part in the town’s affairs during the first half of the fifteenth century: the first held office as coroner, assessor and bailiff between 1398 and 1404; the second was elected to Parliament while serving as bailiff in 1425-6; and the third served in the lesser offices of common clerk and sub-bailiff from the late 1430s. It is probable that the first William was the father of the MP, although the MP was not the father of the third, who is described in a pardon of 1446 as the son of Roger Forster.
The career of the MP was short. He first appears in the records in 1417-18 when, as a draper, he was supplying woollen cloth to the household of Gilbert, Lord Talbot; and in the autumn of 1419 he was elected as coroner in his native town. During his term of office the borough authorities paid for wine to mark the reconciliation of disputes between him and John Perle*, who had held office as coroner in the previous year, and between him and one Hugh Dyer.
Little else is known of Forster’s brief career. In Michaelmas term 1421 he appeared personally in the court of King’s bench to sue a plea of trespass against his putative kinsman, Roger Forster, a yeoman of Wellington, who responded by suing him for debt and detinue of charters. In the same law term, on 29 Oct., William was in his home town to act as a juror in the inquisition taken on the death of John, earl of Arundel.
