Pierre III De Rostrenen

Pierre III was born in 1210.  Pierre III's father was Pierre II De Rostrenen.  His paternal grandfather was Rivalon De Rostrenen.  He was an only child.  He died at the age of 40 in 1250.

‌Pierre III and Jeanne were married in a religious ceremony about 1250.  They had a son and a daughter, named Pierre IV and Plézou.