Probably born in 1328. Abt. 1349 he married Elizabeth, only child and heiress of Lord Segrave. On the death of Segrave in 1353, John entered into possession of her lands, lying chiefly in Leicestershire where the manors of Segrave, Sileby and Mountsorrell rounded off the Mowbray estates about Melton Mowbray. In Warwickshire the castle and manor of Caludon, together with other lordships increased the Mowbray holding in that county.

In the lifetime of his father, he was involved in the wars with France. From 14 August 1362 to 20 January 1366 he was summoned to parliament as "John de Mowbray of Axholme". On 9 Oct 1368 he fell in a conflict with the Turks at Thrace near Constantinople, on his way to the Holy Land, having assumed the cross and embarked on the Crusade.

He had two sons John and Thomas, and several daughters of whom three have known careers.

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