Geoffrey II (1158--1186), Duke of Brittany jure uxoris - by right of marriage to Constance, daughter and heiress of Duke Conan IV of Brittany - was a son of King Henry II of England. Geoffrey died 19 August 1186 and his widow Constance gave birth to Arthur I, Duke of Brittany and heir by primogeniture of England, on 29 March 1187, seven months and ten days later.
Oops! when I started this post I was going to add another posthumous child from European royalty but now I forget who.
Oops! when I started this post I was going to add another posthumous child from European royalty but now I forget who.
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