Laurence’s precise relationship to John Leventhorpe I* of Sawbridgeworth in Hertfordshire, the former receiver-general of the duchy of Lancaster and executor of both Henry IV and Henry V, has not been ascertained, but it was probably not a particularly close one for in John’s will of 1435 he was left no more than the sum of 20s.
Laurence was active in the administration of the Mowbray estates, as parker and keeper of the warren of Stoke in the Sussex lordship of Bosham, which he recovered by an assize in 1455 and held for several years thereafter. More important, at some point in the mid 1450s he served the duke as treasurer of his household, in this role emulating his kinsman John Leventhorpe, who had occupied the post in the previous decade. Yet he was never given a part to play in royal administration in the localities, either under Henry VI or Edward IV, although he received a mark of favour near the beginning of the latter’s reign, when, on 19 Aug. 1461, he secured a potentially lucrative lease at the Exchequer. This, of the lands in ‘Shatcrave’ in the Norfolk hundred of Loddon, taken from the Lancastrian Richard Welles, Lord Willoughby, was backdated to the previous Easter and supposed to last for seven years. Significantly, one of his mainpernors, his kinsman Thomas Leventhorpe†, was then given as resident at Framlingham, Suffolk, the duke of Norfolk’s seat, and it may be speculated that the duke and his affinity, which had supported the new regime, had helped him to obtain the lease.
The wife with whom Leventhorpe received his annuity was Thomasina, widow of Thomas del Rowe, a clerk of the common pleas who had himself once represented the Mowbray borough of Horsham. Del Rowe had purchased a messuage and land in the parish of Chilham in Kent, and in his last will instructed his kinsman, the clerk John del Rowe, to make estate of it in fee simple to Thomasina if she undertook to pay his debts as his executrix. In November 1455 Laurence and Thomasina petitioned the chancellor to bring pressure to bear on John to complete the conveyance, but the clerk claimed to have no knowledge of the will, saying that he believed he had been enfeoffed of the Chilham estate to the use of Thomas’s heirs.
