Isobel of Huntingdon Her husband was Robert de Brus, 4th Lord of Annandale, and their son was Robert de Brus, 5th Lord of Annandale. She is of House of Dunkeld by birth and House of Bruce by marriage. Her parents were David of Scotland, 8th Earl of Huntingdon, and Lady Matilda of Chester. She was born in 1199 and died in 1251 (aged 51–52). Her great-grandson was Robert the Bruce I, King of Scots. Her great-grandfather, through her father's father, was King David I.