Alan FitzWalter & Alesta of Mar 
They had a son and a daughter, named Walter FitzAlan and Avelina FitzAlan.
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Personal Details
Alan FitzWalter
Alan was born in 1133 in Paisley Abbey, Renfrewshire, Scotland.1 He died at the age of 71 in 1204 in Dundonald Castle, Irvine, Ayrshire, Scotland.1
Alesta of Mar
Alesta of was born in 1156 in Mar, Aberdeenshire, Scotland.2 Alesta of is no longer alive.
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Children
Avelina FitzAlan Stewart
Avelina FitzAlan was born in 1179 in Dundonald Castle, Irvine, Ayrshire, Scotland.1
Walter FitzAlan Stewart
Walter FitzAlan was born in 1180 in Dundonald, Kyle, Ayr, Scotland.1 He died at the age of 66 in 1246 in Renfrew, Renfrewshire, Scotland.1