Who married Hugh de Courtenay, 4th Earl of Devon?

Hugh de Courtenay, 4th/12th Earl of Devon (1389 – 16 June 1422) was an English nobleman, son of the 3rd/11th earl of Devon, and father of the 5th/13th earl. 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.