Alexander II Armstrong 
He had a biological son named Alexander III.
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Personal Details
Alexander II Armstrong
Alexander II was born in 1292 in Jedburgh, Roxburghshire, Scotland. He died due to being murdered during a feast at Hermitage Castle. at the age of 28 in 1320 in Hermitage Castle, Lindores, Fifeshire, Scotland.
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Children
Alexander III Armstrong
Alexander III was born before 1320 in Mangerton Castle, Liddesdale, Dumphrieshire, Scotland. He died about 1398 in Hermitage Castle, Lindores, Fifeshire, Scotland.