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Male Duke Wilhelm of Brunswick-Wolfenbhuttel Click to view Duke Wilhelm of Brunswick-Wolfenbhuttel in the family tree

Wilhelm was born in 1270 in Braunschweig, Germany.1   Wilhelm's father was Duke Albrecht (Der Grosse) of Brunswick I and his mother was Princess Alessina of Montferrat.  His paternal grandparents were Duke Otto (das Kind) of Brunswick-Lhuneburg I and Princess Mathilde of Brandenburg; his maternal grandparents were Marchese Bonifacio of Montferrat III and Countess Margherita of Savoy. He had five brothers and a sister, named Heinrich, Der Fette, Otto, Konrad, Lhuder and Mathilde.  He was the third oldest of the seven children.

1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=bevangenealogy&id=I34162

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