John Neville, 1st Marquess of Montagu (c. 1431 – 14 April 1471) was a major magnate of fifteenth-century England. He was a younger son of Richard Neville, 5th Earl of Salisbury, and the younger brother of Richard Neville, Earl of Warwick, the "Kingmaker". From an early age, he was involved in fighting for his House, particularly in the feud that sprang up in the 1450s with the Neville family's major regional rivals, the Percy family. John Neville was personally responsible for much of the violence until, with his brothers, they defeated and imprisoned their enemies. This was taking place against the backdrop of a crisis in central government. The king, Henry VI, already known to be a weak ruler, suffered a mental collapse which led to a protectorate headed by John's uncle, Richard, Duke of York. Within two years an armed conflict had broken out, with York openly in rebellion against the king, and his Neville cousins supporting him. John fought with his father and Warwick against the king at the first Battle of St Albans, at which they had the victory. Following a few years of uneasy peace, the Yorkists' rebellion erupted once again, and John Neville fought alongside his father and elder brother Thomas at the Battle of Blore Heath in September 1459. Although the Earl of Salisbury fought off the Lancastrians, both his sons were captured, and John, with Thomas, spent the next year imprisoned. Following his release in 1460, he took part in the Yorkist government. His father and brother died in battle just after Christmas 1460, and in February the next year, John – now promoted to the peerage as Lord Montagu – and Warwick fought the Lancastrians again at St Albans. John was once again captured and not released until his cousin Edward, York's son, won a decisive victory at Towton in March 1461, and became King Edward IV. John Neville soon emerged, with Warwick, as representatives of the king's power in the north, which was still politically turbulent, as there were still a large number of Lancastrians on the loose attempting to raise a rebellion against the new regime. As his brother Warwick became more involved in national politics and central government, it devolved to John to finally defeat the last remnants of Lancastrians in 1464. Following these victories, Montagu, in what has been described as a high point for his House, was