son. The "crusade" resulted in an unsuccessful siege of Vilnius and the capture of Lithuanian women and children, who were then converted to Christianity. It is not known if Erpingham was present with Bolingbroke at the siege. Erpingham was with Bolingbroke when he returned unnecessarily to Prussia in July 1392—a peace was being made in Lithuania between its ruler, Władysław II Jagiełło, and his cousin Vytautas, and the crusaders who had supported Vytautas had already left. Bolingbroke and his reduced retinue journeyed through Europe and the Near East, visiting Prague, Vienna, Corfu, and the Holy Land. It is thought that it was in Italy that Erpingham obtained the silk for the chasuble which bears his name, now in the Victoria and Albert Museum. Revolution of 1399 The historian Helen Castor has described the Lancastrian presence in East Anglia as a "disparate collection” that lacked coherence or a single identity. Erpingham rose to become the most important of Lancaster's retainers in the region. He was appointed to a commission of peace, and given powers to preserve order in Norfolk in the aftermath of the Peasants' Revolt in the summer of 1381. He had a part in supervising the defence of Norfolk in 1385, when a French invasion seemed imminent. In 1396 Lancaster granted him the legal right to use the land within the hundred of South Erpingham, a reward for his loyal service to the Duchy of Lancaster. In January 1398 a dispute erupted between Bolingbroke and Thomas de Mowbray, 1st Duke of Norfolk, after Mowbray had attempted to ambush and kill Lancaster, and which the King ordered be settled by a trial by battle between the two men. During the five months before 16 September, the day the trial was due to take place, Bolingbroke travelled throughout England on a tour of the Lancastrian lands. Richard stopped the contest as it was about to begin and banished Bolingbroke from the kingdom for ten years, and exiled Mowbray for life. Those assembled were told that the trial had been stopped to avoid dishonouring the loser and to prevent a feud from arising, but chroniclers (writing after Henry IV's accession) considered Richard's decision an act of revenge. Bolingbroke, as one of the five Lords Appellant, had rebelled in November 1387; for a year they maintained Richard as a figurehead with little actual power. Erpingham was one of 17 named companions who volunteered