Sir Thomas Erpingham (27 June 1428) was an English soldier and administrator who loyally served three generations of the House of Lancaster, including Henry IV and Henry V, and whose military career spanned four decades. After the Lancastrian usurpation of the English throne in 1399, his career in their service was transformed as he rose to national prominence, and through his access to royal patronage he acquired great wealth and influence. Erpingham was born in the English county of Norfolk, and knighted when a young man. During the reign of Richard II he served under the King's uncle John of Gaunt, Duke of Lancaster, in Spain and Scotland, and was with Gaunt's son Henry Bolingbroke on crusades in Lithuania, Prussia and the Holy Land. Erpingham accompanied Bolingbroke into exile in October 1398, and was with him when he landed at Ravenspur in July 1399 to reclaim his inheritance as Duke of Lancaster, after his lands had been forfeited by Richard. Bolingbroke rewarded Erpingham by appointing him as constable of Dover Castle and warden of the Cinque Ports, and after ascending the throne as Henry IV he made him chamberlain of the royal household. Erpingham later helped to suppress the Epiphany Rising and was appointed guardian of Henry's second son Thomas. He was a member of the Privy Council, acting at one point as marshal of England. He attempted to have Henry le Despenser, the anti-Lancastrian bishop of Norwich, impeached as a rebel. On becoming king in 1413, Henry IV's son Henry of Monmouth appointed Erpingham as steward of the royal household. Henry IV's reign had been marked by lawlessness, but Henry V and his administrators proved to be unusually talented, and within twelve months law and order had been re-established throughout England. In 1415 Erpingham was indentured to serve as a knight banneret, and joined Henry's campaign to recover his lost ancestral lands in France and Normandy. Erpingham presided over the surrender of Harfleur. On 25 October 1415 he commanded the archers in the Battle of Agincourt, where he was positioned alongside the king. Erpingham married twice, but both marriages were childless. He was a benefactor to the city of Norwich, where he had built the main cathedral gate which bears his name. He died on 27 June 1428, and was buried in Norwich Cathedral. Ancestry and early life Thomas Erpingham was born in about 1357, the son of Sir