Question: What is the date of birth of Isabella Of Mar's husband?
Sentence (from "Robert the Bruce"): Robert I (11 July 1274 – 7 June 1329), popularly known as Robert the Bruce (Medieval Gaelic: '; modern Scottish Gaelic: '; Norman French: ' or '; Early Scots: "Robert Brus"), was King of Scotland from 1306 until his death in 1329.
Relevant evidence: Yes