Cosworth’s forebears were probably resident at Cosworth in the parish of Colan by the mid-fourteenth century. His grandfather and uncle, John† and Thomas Cosworth†, enjoyed significant influence in Cornwall as successive receivers-general of the Duchy from 1553 to 1586, but their landed base was relatively small, barely extending beyond Colan’s immediate neighbourhood.
Little is known of Cosworth prior to his marriage in 1627. Bridget Hele was mother-in-law to his eldest brother Samuel, so the union consolidated existing ties with the influential Hele family.
Cosworth’s subsequent career is uncertain. In his father’s will, proved on 16 Jan. 1640, he received £200, apparently to clear a bond given by his brother Samuel.
