Question: What is the date of birth of Isabella Of Mar's husband?
Sentence (from "Robert the Bruce"): Appointed in 1298 as a Guardian of Scotland alongside his chief rival for the throne, John III Comyn, Lord of Badenoch, and William Lamberton, Bishop of St Andrews, Robert later resigned in 1300 due to his quarrels with Comyn and the apparently imminent restoration of John Balliol to the Scottish throne.
Relevant evidence: No