While York and his allies ended up fighting against the king, Beaumont remained loyal to the Lancastrian crown during the 1450s, which saw the beginning of the Wars of the Roses.

[1] On 24 July 1425 his marriage rights were granted by the council to Sir John Radcliffe as part-payment for debts owed him by the crown.

[1] Combined with his own inheritance in Leicestershire, he was a figure worthy of the association of William de la Pole, Earl of Suffolk (died 1450), and from there entered the household of King Henry VI.

[6] Dr. John Watts has suggested that, as a royal ward, he may have been brought up in the king's household as a young man, and that his later generous treatment was a consequence of this.

[7] For this service he was granted the county of Boulogne in reward; he was not, however, to ever return, even though the earl of Warwick had named him as one of the preferred nobles to accompany him back to France that year to relieve York.

[14] By 1440 he was firmly in the king's favour, being made in succession the first ever English viscount as Viscount Beaumont (1440),[15] possibly because by then Boulogne was effectively lost to him[16] and then granted royal lands in East Anglia, further official positions in royal castles, Lord Great Chamberlain, appointed a Knight of the Garter and the feudal Viscountcy of Beaumont in France.

[2][17] These consistent promotions and favouritism have been the subject of some speculation by historians; John Watts has questioned why he 'attracted such an extraordinary heap of honours and perquisites from the crown in these years.'

[19] Elizabeth Phelip, Beaumont's first wife, died by October 1441, and within two years he married Katherine Neville, the dowager Duchess of Norfolk.

[21] As Steward of England,[22] he personally- although accompanied by, for example, other lords such as Buckingham and the earl of Salisbury[23]- arrested Humphrey, duke of Gloucester for treason, in Bury St Edmunds 18 February 1447.

[24] Throughout the subsequent period of foreign catastrophe which, to contemporaries, came to symbolise the failure of Suffolk's government in the late 1440s, Beaumont not only supported the duke's policy but backed him during his impeachment.

[29] At the outbreak of Jack Cade's Rebellion, he was commissioned on 10 June 1450 to reinforce London,[30] and accompanied Henry VI back to the capital in July.

[39] He was one of the few Lords Temporal to remain in Henry VI's council in the closing years of the decade, by which time he was the queen's chief steward.

This failed,[1] and Beaumont's second son (but who was his heir)[2] – the by now second Viscount fought against the victorious army of the Yorkist king, Edward IV at the battle of Towton in March the next year.