THOMAS de Coucy, son of RAOUL [I] Seigneur de Coucy et de Marle & his second wife Alix de Dreux [Capet] (-[1252/53]). The 13th century Histoire des ducs de Normandie et des rois d´Angleterre names "Engherrans de Couci…si doi frère Thumas et Robiers"[1012]. "Radulfus dominus Cochiaci" donated property to Mont Saint-Martin, with the consent of "uxore mea Adelide et liberis meis Ingelranno, Thoma, Radulph, Roberto", by charter dated 1187[1013]. The testament of "Radulphus dominus Couciaci" on the point of leaving on a journey, dated 1190, bequeathed "Veruinum, Fontanas et Landousies" to "filius meus Thomas"[1014]. Seigneur de Vervins. "Engelrannus de Couciaco comes Perticensis" confirmed donations to Thenailles abbey made by "Radulphi patris nostri", with the consent of "uxoris nostræ comitissæ de Pertico et fratrum nostrorum Thomæ iam militis et Roberti", by charter dated 1205[1015]. "Thomas de Cociaco Vervini dominus" granted "homines de Tria et de Charmentrei" rights "super…terra quæ ex parte Mathildis uxoris meæ de dono Hugonis comitis Regetensis ad me devenit" by charter dated Dec 1212[1016]. "Thomas de Cociaco dominus Vervini et Mathildis uxor eius" issued a charter dated Sep 1223 under the guarantee of "domini sui Theobaldi, Campaniæ et Briæ comitis palatini"[1017].
m (before Dec 1224) MATHILDE de Rethel, daughter of HUGUES Comte de Rethel & his wife Félicité de Broyes (-after 1255). Her parentage and marriage are confirmed by the charter dated Dec 1224 under which "Thomas de Coucy seigneur de Vervins" acknowledged "Hugues comte de Rethel et Félicité sa femme" had granted property at Sézanne to "leur fille Mathilde, femme dudit Thomas", with the consent of "Hugues leur fils ainé"[1018]. Dame de Trie-le-Bardoul et de Charmentré. "Thomas de Cociaco Vervini dominus" granted "homines de Tria et de Charmentrei" rights "super…terra quæ ex parte Mathildis uxoris meæ de dono Hugonis comitis Regetensis ad me devenit" by charter dated Dec 1212[1019]. "Thomas de Cociaco dominus Vervini et Mathildis uxor eius" issued a charter dated Sep 1223 under the guarantee of "domini sui Theobaldi, Campaniæ et Briæ comitis palatini"[1020]. "Thomas de Coucy sire de Vervins et Mahaud sa femme" transferred their rights in "l´héritage de leur niece, la fille du comte Hugues" to "leur frère Jean comte de Rethel"[1021]. "Mahaud dame de Vervins et Thomas de Coucy son fils sire de Vervins" donated "Montigny dalès Poys" to "Gaucher comte de Rethel" by charter dated Oct 1255[1022].
Thomas & his wife had five children