Nothing is known of Sonbache’s origins, but his name implies they lay in Sandbech in Cheshire. If so, it may be that he was a kinsman of Philip Sonbache, one of Richard II’s Cheshire bodyguard in 1398.
The young Sonbache was also associated with another resident of Uttoxeter, Erdeswyk’s ally, John Mynors*, with whom, in Hilary term 1419, he acted as a surety in the court of King’s bench.
By this date Sonbache had either married or was about to marry a minor heiress of a junior branch of the Derbyshire family of Fitzherbert settled at Roston, a few miles to the north of Uttoxeter. The couple were married by June 1424, when they surrendered her claim to certain lands in Hornby (Yorkshire) to Christopher Conyers.
This promising advancement had little recorded sequel. In 1434 Sonbache was among those returned by the county’s MPs as of sufficient standing to be required to take the parliamentary oath not to maintain peace-breakers, and in 1439 his grant of the forestership was extended to life
According to a later ex parte plea at the Cheshire assizes in the great dispute between his master, the earl of Stafford, and (Sir) Thomas Stanley II*, over the manor of Bosley, by 13 Dec. 1443 Sonbache was, in right of his wife, Elizabeth, the joint hereditary bailiff of the King’s hundred of Macclesfield, in which the disputed manor lay.
