Claimant

Malcolm's mother was the sister of the Earl of Northumberland. So the son of Duncan was half-English; and he became more than half-English when, somewhat later, he married Margaret, sister of his friend and guest, "Edgar the Atheling," last claimant of the Saxon throne, who had taken refuge with him while vainly plotting against William the Conqueror.

Source: tatoeba (12158697)

“Two or three months more went by ; the public were eagerly awaiting the arrival of this semi-exotic claimant to an English peerage, and sensations, surpassing those of the Tichbourne case, were looked forward to with palpitating interest.[…]”

Source: wiktionary