Sir Geoffrey de Genevill, in the 38th Henry III [1254], had livery of the castle of Trim, in Ireland. In four years afterwards he received a military summons to march against the Welsh, and in the 44th of the same king [1260], then being one of the barons marchers, he had command to repair to the castle of Wales, and to reside there. In the 10th Edward I [1282], he was in the expedition made against the Welsh, and in fifteen years subsequently, he was in the wars of Gascony. For all which services he was summoned to parliament as a baron, 6 February, 1299, and from that period to 3 November, 1306. He m. Maud, dau. and heir of Gilbert de Lacey, son of Walter de Lacey, Lord of Meath, and had issue, Geoffrey, Peter, and Simon. His lordship d. in 1307, and was s. by his son, Peter de Genevill, 2nd baron. [Sir Bernard Burke, Dormant, Abeyant, Forfeited and Extinct Peerages, Burke's Peerage, Ltd., London, England, 1883, p. 228, Genevill, Baron Genevill]
NOTE: Burke, in Dormant, Abeyant, Forfeited and Extinct Peerages, says Peter de Genevill was his father.