Guillaume Costiou
- Born on April 6, 1689 in Névez
- Deceased on December 24, 1767 in this municipality, at the age of 78 years
Parents
- Yves Costiou (1647 - 1691), laboureur
- Marguerite Jaouen (1659 - 1702)
Family
- Married on January 24, 1714 in Névez, with Marie Chastelen (1683 - 1766), issuing
Marie (1715 - 1776)