- Sir Thomas Percy (1366-1387), son of Sir Henry Percy (1341-1408), 1st earl of Northumberland and Margaret de Neville.
- Nephew of Sir Thomas Percy (1344-1403), 1st earl of Worcester, who also participated in Johnof Gaunt's Peninsular campaign.
- Died during John of Gaunt's Peninsular expedition to claim the crown of Castine in his wife's name, daughter and heir of the murdered Pedro of Castile.
- Anthony Goodman, John of Gaunt: the Exercise of Princely Power in Fourteenth-Century Europe (London: Longman, 1992), pp. 117.
Tomas Persy
Chronicle entries in which Thomas Percy, the younger appears:
Crónica de D. João I, part 2, ch. 83