Collingbourne’s father Richard, who occupied the post of clerk of the peace in Wiltshire for some 23 years from 1390, represented Marlborough in the Parliament of 1402. The family originated from one or other of the villages of that name situated to the south of Marlborough and not far from Great Bedwyn. It was in the latter place that the Collingbournes took up residence, after Richard acquired a manor there. He may be regarded as the founder of the fortunes of this family of minor gentry, which rose in status during the fifteenth century mainly through service to social superiors.
Collingbourne’s career as an attorney began in the mid 1420s both at the assizes held at Salisbury, and in the law-courts at Westminster, where inter alia he represented his mother in suits in King’s bench.
Before his first election to Parliament Collingbourne had been singled out by the wealthy Wiltshire landowner (Sir) John Stourton II* (afterwards Lord Stourton) to be a feoffee of parts of his inheritance in Essex, Somerset and Hampshire, and Stourton thought highly enough of his abilities to engage him as an attorney in the common pleas in Hilary term 1431, while that Parliament was in progress.
In the early 1430s Collingbourne was sometimes employed by sheriffs of Wiltshire to receive writs on their behalf in the law courts.
Collingbourne once more attested the parliamentary elections for his home county in 1435, this time endorsing Seymour’s election as a shire-knight, and on the same occasion he himself was returned to the Commons for a third time, now as a representative for Marlborough. That he continued to be a member of Seymour’s circle is clear from the list of witnesses to a conveyance made in his interest in 1441: headed by Sir John they included a number of the latter’s kinsmen and friends, among them John Sturmy* (Seymour’s uncle of the half-blood), who had accompanied Collingbourne to the Commons ten years earlier. It had been for Sir John Stourton that our MP had again served as under sheriff in Gloucestershire, that same year,
In his final years Collingbourne, now usually designated ‘esquire’, continued to be associated with the Seymours.
