Guillaume de la Guerche, II

From Medlands:

MARQUISE . Her parentage and marriage are confirmed by the charter dated 1162 under which "Mauritius de Credonio" donated property to "monachis sancti Melanii", at the request of "Marquisiæ matris meæ et Gaufredi de Poëncio nepotis mei et Paganus de Vegia", signed by "Gaufrido de Poencio nepote meo, Hugone de Guirchia fratre suo, Pagano de Vegia et Marquisia matre mea eius uxore…"[143]. The primary source which confirms her name has not yet been identified. m GUILLAUME Seigneur de la Guerche, son of --- (-after 1156).

This profile originally read first name Hugues but the husband of Marquise was Guillaume so I changed the name. It is possible therefore that there was also a Hugues however Medlands states the following:

Two brothers. The primary source which confirms their parentage has not been identified. The inheritance by Guillaume of the seigneurie de la Guerche suggests a family relationship with Gauthier Hay Seigneur de la Guerche (see above). One possibility is that he was the son of Gauthier´s daughter Emma. If that is correct, he would presumably have been born from her first marriage as there is no indication that la Guerche passed to the family of Robert de Vitré, her second husband. However, out of the names typical of the Châteaubriand family (Briand, Juhael, Tihern, Geoffroy), only Geoffroy is found in the family of the later seigneurs de la Guerche and this is a relatively common name which is connected with many other families. The name Hamon, borne by Guillaume´s brother, is also not associated with the Châteaubriand family. On balance, unless another primary source emerges which confirms the relationship, the indications of descent from the Châteaubriand family are weak.

2. HAMON de la Guerche (-after 1140). "Guarinus dominus Credonensium" donated property to La Roë, in the presence of "Guillelmus de Guierchia…De hominibus Guillermi de Guierchia, Hamo frater eius...", by undated charter[672].