Pierre I de Dreux , Count of Brittany

Pierre I was born about 1187.  Pierre I's father was Robert II Cmte de Dreux and his mother was Yolande de Coucy. He had a brother and a sister, named Robert III and Philippa.  He was the second oldest of the three children.  He died on June 22nd, 1250.

‌Pierre I were married in a religious ceremony in 1213.