The Trenchard family had held a prominent position on the Isle of Wight in the twelfth and thirteenth centuries, and this was to be revived in the lifetime of our MP.
Trenchard’s path to a place at as an esquire in the King’s household cannot now be mapped, yet no sooner there than he quickly established a connexion of the highest importance. In December 1441 he assisted the steward of the Household, William de la Pole, earl of Suffolk, and his wife Alice in transactions for their acquisition of a manor in Suffolk from the executors of Sir William Porter†.
It is indicative of the position of influence Trenchard held at Court that on 3 Mar. 1446 he obtained confirmation of letters patent granted three years earlier, granting him and his male issue in reversion the important offices of constable of Carisbrooke castle and forester of the Isle of Wight, along with custody of the royal park there and the post of porter of the castle, to take effect immediately after the death of Humphrey, duke of Gloucester. His fees were to amount to as much as £30 p.a. as constable and forester, with 8d. per day in addition as parker and porter. Trenchard insisted that the patent should state that ‘if these letters are in any wise invalid, the chancellor shall have authority at the suit of Trenchard or his heirs to amend them by advice of the Council and to cause others to be made, without any suit before the King’.
Trenchard, still wearing the livery of an esquire of the Household and now (following Gloucester’s death) constable of Carisbrooke, was elected to Parliament for his home county in the autumn of 1449. The elections should be seen in the context of the renewal of war across the Channel and the French assault on the English garrisons in Normandy, and Trenchard’s companion, Sir John Popham*, was clearly chosen for his wealth of experience of the war. Trenchard may have been put forward because the defence of the south coast (including the Isle of Wight) had become an urgent priority, yet it may also be suspected that the sheriff, Robert Fiennes*, an esquire for the King’s body and nephew of the duke of Suffolk’s ally James Fiennes*, Lord Saye and Sele, promoted his candidacy on the assumption that he would lend support to these royal ministers in Parliament. In the event, there was little that Suffolk’s men in the Lower House could do to defend him against overwhelming criticism and hostility, which reached a climax during the second session. The impeached duke was sent into exile and to his death.
In the course of the Parliament Trenchard’s letters patent regarding his office as riding-forester had been annulled by the Act of Resumption, but two years later, on 4 July 1452, he was restored to the post with a further grant for life.
The descent into civil war in 1459-60 saw an attempt by (Sir) Henry Bruyn to regain his former ascendancy on the Isle of Wight, and to challenge Trenchard’s authority there. In April 1460, so Bruyn later alleged, Trenchard assaulted two of his servants at Newport and imprisoned and maltreated them at Carisbrooke, while several of the islanders, presumably Trenchard’s followers, committed other trespasses against him. It would seem, however, that with respect to their political alignments the two men had changed sides. After the Yorkists took control of the government following their victory at Northampton a commission was issued to the sheriff of Hampshire on 15 Oct. to arrest Bruyn for illegally entering the royal forests on the island, and Trenchard proceeded with suits for trespass against him in the Westminster courts, alleging that Sir Henry and his men had broken into his property at Purewell, near Christchurch, and wounded him so badly that he nearly lost his life.
Little is recorded of Trenchard’s private affairs. He had been named as a feoffee of lands on the Isle of Wight for his father-in-law John Mone in 1458, but otherwise seems to have had little contact with him.
The MP’s heir was his elder son John (b.c.1453), who had inherited the estates of his maternal grandfather John Mone in 1479. No doubt Mone had been responsible for arranging his grandson’s marriage to a daughter of a friend of his, the Dorset landowner John Filoll*, who had sat with Trenchard in the Parliament of November 1449. Shortly after his father’s death John Trenchard rose in rebellion against Richard III, and suffered attainder and forfeiture in the Parliament of 1484. Yet he lived to be restored to his inheritance by Henry VII, by whom he was knighted. Sir John took as a second wife Margery, daughter of John Wyke II* of Bindon, and widow of his kinsman John Cheverell (d.1485), and died in 1495.
