Pierre I Sire de Grandson
was born at Neuchatel, Ne, Switzerland Abt 1190.
His parents were Ebal IV Sire de Grandson and Beatrix de Geneva.
He married Agnes de Neuchatel
Agnes de Neuchatel
was born at Neuchatel, Ne, Switzerland Abt 1194
daughter of Ulric III de Neuchatel and Yolande de Urach Arberg
They were the parents of 2
Amadeus de Grandson
William de Grandison, Knight
born Abt 1255/64.