[3] A son of Thomas Langstrother of Crosswaite, he was by 1463 a councillor of the Yorkist king Edward IV.
He was an administrator of the Knights of St John of Jerusalem and on 9 March 1469 was unanimously chosen as Prior of England, the Order's chief officer in the kingdom.
Following the defeat of Edward's supporters by the Earl of Warwick on 26 July 1469 at the Battle of Edgecote Moor he was appointed Lord High Treasurer by the short-lived regime of the Duke of Clarence and Warwick, but was dismissed by Edward when he regained power in mid-September.
He was reinstated in October 1470 as Treasurer and Warden of the Mint after the temporary re-accession of Henry VI, who had been restored with the help of Clarence and Warwick.
[1][4][5] He was buried in the Order's hospital of St John at Clerkenwell.