[2] However, during the reign of Edward IV the Pastons were granted a declaration that they were "gentlemen discended lineally of worship blood sithen [within] the conquest hither".
[2][3] He became serjeant-at-law about 1418, and on 15 October 1429 was appointed a Justice of the Common Pleas, a position in which he served until shortly before his death.
[2][4] In 1418, he and his wife, Agnes, provided funds for the rebuilding of the parish church at Therfield, where they were formerly commemorated by an inscription in the east window of the north aisle.
She died on 18 August 1479, and was buried at the Whitefriars, Norwich, with her parents, grandparents, and youngest son, Clement, who had predeceased her.
[2][6] In 1420, at the age of forty-two, Paston married Agnes Barry or Berry (d. 18 August 1479), the daughter and coheir of Sir Edmund Barry (d.1433) of Horwellbury, near Therfield and Royston, Hertfordshire,[7] by whom he had four sons and one daughter:[8][2][9][5] Many letters written by William Paston's family and their circle have survived, making the Paston Letters an exceptionally valuable collection of historical documents; the Oxford Dictionary of National Biography has called them "the richest source there is for every aspect of the lives of gentlemen and gentlewomen of the English middle ages".