Netherton’s parentage is obscure, but he may have been related to Thomas Netherton, an Exeter citizen who served as alderman outside the north gate between 1425 and 1431, and again in 1441-2.
Instead, Netherton built a career in the service of the regional gentry, particularly the members of the late Lord Bonville’s circle, to whose attention he had perhaps come as one of the Radford feoffees. By the autumn of 1462 he was serving as bailiff of one of the central Devon manors of Bonville’s close associate (Sir) Philip Courtenay of Powderham, who before his death in the following year apparently also entrusted him with the custody of much of his estate archive (as Courtenay’s heir would later complain to the chancellor),
As Netherton grew in importance, so he increasingly came into conflict with his neighbours. In 1463 he claimed to have been assaulted, robbed and imprisoned by a group of Exeter men led by Thomas Calwodlegh*,
Netherton’s primary loyalties nevertheless remained with the Courtenays of Powderham. In August 1467, Edward IV had granted the Devon manor of Kenne, part of the forfeited estates of the attainted earls of Devon, to his kinsman Sir John Bourgchier, despite the fact that some two years earlier he had confirmed the youngest of the Courtenays of Powderham, John Courtenay† in his possession of the manor. In response, Netherton and his two putative sons, John junior and Henry, with a band of armed retainers held Kenne against Bourgchier, who retaliated with litigation in the court of King’s bench, as well as a petition to the King’s council. This proved to be of little avail, as the Nethertons simply ignored the privy seal writs summoning them to Westminster. A renewed complaint to the chancellor produced instructions for their arrest, but it is unlikely these were ever carried out, for within a few weeks of their issue, Exeter and its hinterland were in turmoil.
Throughout much of 1469, the earl of Warwick together with his cousin, Edward IV’s brother, the duke of Clarence, had been plotting against the King. Risings in the north orchestrated by Warwick had provided the pretext for the murder of several of the King’s favourites and had allowed Warwick to take the monarch himself into his custody. In September 1469, Edward IV had regained his liberty, but had in the first instance sought to rebuild relations with his disgruntled kinsmen. By the spring of 1470, it became apparent that he had failed, as the complicity of Warwick and Clarence in fresh popular unrest in the north became apparent. Moreover, a separate uprising was now staged in Devon by various Courtenay cadets who had been drawn into Clarence’s orbit. On 16 Mar. Edward IV, preoccupied by the rising in Lincolnshire, dispatched John, Lord Dynham, and Fulk Bourgchier, Lord Fitzwaryn, to Exeter to arrest Sir Hugh Courtenay* of Boconnoc, his cousins (Sir) William*, Peter, Philip†, Humphrey and Walter Courtenay† of the Powderham line, along with several of their supporters, Netherton among them. The two lords reached Exeter, but within days of their arrival found themselves besieged in the city by the Courtenays. On 3 Apr. Warwick and Clarence arrived and raised the siege, but the King was hot on their heels and within a few days they were forced to set sail to seek refuge in France.
Netherton’s probable younger son, Henry, who in the course of the crisis of 1470-1 had been sent to Leicester by the citizens of Exeter to gain a clearer picture of the dramatic developments, followed his putative father into Courtenay service, and held office as bailiff of that family’s hundred on Wonford in the 1490s.
