Pierre III De Rostrenen & Jeanne De Parthenay 
Pierre III and Jeanne were married in a religious ceremony about 1250. They had a son and a daughter, named Pierre IV and Plézou.
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Children
Pierre IV De Rostrenen
Pierre IV was born in 1245. He died at the age of 62 on March 11th, 1307 in , Guingamp, 22,.
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