Most of the evidence which has survived about the subject of this biography concerns his involvement in the various vendettas waged by his elder brother, Hugh, against a number of eminent local figures during the early years of the 15th century. According to the long list of indictments filed against the four Erdeswyk brothers in the presence of Henry V at the Lichfield assizes of 1414, Sampson first took up arms in about 1407 when he joined in an attack on Hugh’s confirmed enemy, Sir John Bagot. Not long afterwards he is reputed to have broken into a house at Uttoxeter and assaulted the owner. He was accused of other acts of violence, the most notable being an attempt to disrupt a session of the peace at Hawkstone, Staffordshire, in September 1413.
lui bateront, naufreront orriblement mahemeront, c’est assavoir articles de ses pees trencheront ses jambes, brais & mains par divers horribles plaies couperont & debrusseront, par ount ses nerves sount devenuz secchez, & il claudant mahemez a toutz jours, & ses articles issint coupes misteront en le bouche de dit Sampson, & apres ovesque eux asporteront, & luy pur mort lesseront.
RP, iv. 32-33.
Erdeswyk’s petition (which was countered by one from Lord Ferrers) suggests that the royal commission set up in February 1414 to investigate the attack on his brother had been as ineffective as those previously empowered to discipline members of his own family. Evidence of such blatant disorder in Staffordshire did, however, prompt Henry V to visit the Lichfield assizes during the Trinity term of that year, and hear in person the many charges laid against the Erdeswyk brothers. Even so, none of the chief protagonists were denied the royal pardon (Sampson obtained his in May 1415), and none appear to have been punished in any way for their riotous behaviour.
Even though he sat only once in Parliament, Erdeswyk attended the county elections of May 1423 and 1426, on the last occasion heading the list of electors.
