Sir Edward Courtenay was the eldest son of Edward de Courtenay, 11th Earl of Devon. He fought at Agincourt, and was killed in a sea battle in Henry V's continuing campaigns in Normandy.

Edward de Courtenay, 3rd/11th Earl of Devon, known by the epithet the "Blind Earl", was the son of Sir Edward de Courtenay and Emeline Dawnay, and in 1377 succeeded his grandfather, Hugh Courtenay, 10th Earl of Devon, as Earl of Devon. The ordinal number given to the early Courtenay Earls of Devon depends on whether the earldom is deemed a new creation by the letters patent granted 22 February 1334/5 or whether it is deemed a restitution of the old dignity of the de Redvers family. Authorities differ in their opinions, and thus alternative ordinal numbers exist, given here.