On 29 December 1299 John St John was summoned to Parliament, and thereby became the 1st Baron. Following his decease his son was never summoned nor was his grandson, Edmund de St John, 3rd Baron St John (1333-1347) of Basing, who died in Calais aged 14 a few days after the Siege of Calais. On his death in 1347 the barony fell into abeyance between his two sisters Margaret and Isabel. Fourteen years later in 1361, the death without issue of Margaret's only son and heir John St Philibert ("alias" St John) resulted in the termination of the abeyance in favour of the remaining sister Isabel St John, whose husband Lucas de Poynings was summoned in 1367/8, presumably in her right. At the death of Thomas Poynings, 5th Baron St John in 1428/9, the barony fell into abeyance again among his grand-daughters and their heirs. William Paulet, a descendant of the middle granddaughter, was summoned in 1538/9 (as Baron St John in his initial summons, but later as Baron St. John of Basing). He was not the senior heir, and this represented a new creation and not the termination of the abeyance. He was later created Earl of Wiltshire and Marquess of Winchester, into which titles the new barony merged.