There can be no doubt that the John Leventhorpe returned for the Sussex town of Horsham in 1453 was a member of the affinity of John Mowbray, duke of Norfolk, the lord of the borough. But a degree of uncertainty remains as to his identity. A strong case might be made that the MP was the long-lived John Leventhorpe (d.1484), of Sawbridgeworth, Hertfordshire, and Ugley, Essex,
On balance, it seems much more likely that the MP for Horsham was the ‘esquire’ who in the 1450s lived at Southwark, and who twice provided sureties at the Exchequer for the keepers of the royal manor of Eltham in the summer before the Parliament met.
The Horsham election to the Parliament summoned to meet at Reading on the following 6 Mar. was held on 28 Feb., with Leventhorpe being returned for the borough with William Goureley*, a Derbyshire man employed by the duke of Norfolk as an auditor, as his companion.
Parliament assembled for its final session, at Westminster on 14 Feb. A few days earlier the marshal had been bound on pain of £1,000 to hold Sir Thomas Mallory securely in his prison and not to allow him bail without the permission of King’s bench. When this was eventually allowed, in Easter term, for Mallory’s good behaviour and appearance in court in the Michaelmas term, Leventhorpe and several other servants of the duke of Norfolk provided sureties.
Following this disgrace, Leventhorpe is not recorded until 4 Jan. 1457, when he transferred all his goods and chattels to his wife Katherine and two other members of his family This may well have been done in order to evade the consequences of suits for debt then proceeding against him, notably a plea brought by William Fitzhugh for £20 3s. 4d. But it also looks as if he was seriously ill, and was making preparations for death. Ten days earlier, on Christmas Day, the duke of Norfolk had granted the reversion of his office of marshal of the Marshalsea to William Brandon†, and as on 21 Jan. Brandon formally succeeded to the post, Leventhorpe must have died in the meantime.
