HENRI de Bretagne, son of ETIENNE de Bretagne Lord of Richmond & his wife Hawise de Guingamp ([1100]-early 1183[957]). “Stephanus comes Britanniæ” donated property to Rumburgh priory, for the souls of “comitissa Haudewisa…filiorum meorum et filiarum…Galfridi…Alani, Henrici” by undated charter[958]. His father gave him the Soke of Waltham, Lincs. He succeeded his father in [1136] as Comte de Tréguier et de Guingamp. "Alan comes et indigena of England and count of Brittany" donated property to the abbey of Holy Trinity, Sauvigny by charter dated to [1137/46], subscribed by "…Hainrico fratre meo…"[959]. "Henricus comes" donated "ecclesiam Sancte-Crucis de Gingamp" to La Trinité de Vendôme by charter dated to [1147/56], signed by "Henricus et Matillis uxor mea, Johannes comes Vindocinensis…"[960]. "Henricus, comitis Stephani filius" donated property to the priory of Saint-Magloire de Léhon, for the souls of "patris…et fratris Stephani…et Alani comitum, matris…mee Hadvise", by charter dated 1148[961]. "Comitis Hainrici...comitis Stephani filii" donated Saint-Sauveur de Guingamp to Marmoutiers by charter dated 19 Sep 1151 "die ipso quo Hainricus comes Mathildem filiam Johannis Vindocin. comitis apud Meduanam uxorem duxit"[962]. "Henricus comes" donated property to the priory of Saint-Magloire de Léhon for the soul of "Roberti comitis", with the consent of "filiorum meorum Alani, Stephani atque Conani", by charter dated [1151/59][963]. "H...comes" donated Sainte-Trinité de Guingamp to Saint-Melaine abbey, for the souls of "patris mei Ste. matris meæ Ha...fratrum meorum Gaufridi et Alani et...filii mei Henrici", by charter dated 1152[964]. His nephew Conan IV Duke of Brittany dispossessed him of Tréguier and Guingamp, which were given to the duke's daughter Constance after Duke Conan was dispossessed by Henry II King of England[965].
m (Mayenne 19 Sep 1151) MATHILDE de Vendôme, daughter of JEAN I Comte de Vendôme & his first wife [Berthe du Puy-du-Fou] (-[1214]). A fragmentary chronicle of the dukes of Aquitaine names "Buchardus, Lancelinus, Galfridus et Mahauda" as the children of "Johanni Comiti primogenitor Galfridi Grisagonellæ Comitis Vindonicensis atque Mahaudæ Castridunensis" and his wife "Bertham"[966]. "Lancelinus filius Johannis comitis Vindocini, Mathildis filia eiusdem Johannis, item alia filia Mathildis" consented to the charter dated 1139 under which "Goffridus Grisagonella comes Vindocini et Johannes filius eius" donated part of the forest of Gâtineau to the abbey of La Trinité de Vendôme[967]. "Comitis Hainrici...comitis Stephani filii" donated Saint-Sauveur de Guingamp to Marmoutiers by charter dated 19 Sep 1151 "die ipso quo Hainricus comes Mathildem filiam Johannis Vindocin. comitis apud Meduanam uxorem duxit"[968]. The Chronicon Ruyensis Cœnobii records the death in 1214 of "Mathildis Comitissa"[969], which may refer to the widow of Henri Comte de Tréguier although she would have been old at the time.
Henri & his wife had six children