PHILIPP [I] von Vianden, son of HEINRICH [I] Graf von Vianden & his wife Marguerite de Courtenay (-23 Apr 1273). "Henricus et Margarita comitissa Viennensis" founded a monastery at Vianden, with the consent of "Philippi nostri primogeniti", as well as anniversaries for themselves "et filiorum nostrorum…Friderici et Philippi", by charter dated Jun 1248[369]. Graf von Vianden. Heer van Perwez en Grimberghe.
m (before 10 Mar 1262) MARIE van Perwez, daughter of GODEFROI de Louvain Heer van Perwez & his wife Alix van Grimberghe (-Sep 1289). Her parentage and marriage are confirmed by the testament of her brother "Godefrois sires de Perwei et de Grimberges" dated 25 Jul 1264 which names "mes seurs Marie comtesse de Vianne et Adain dame de Bruec"[370]. Vrouw van ½ Grimberghe, Ninove, Rumpst, Hoboken, Eekeren, Ingen, Havensberghe, Corroy, Frasne en Londerseel. "Philippus comes Vianensis dominus de Grimbergis et Maria eius uxor domina dictorum locorum" donated property to Grimbergen by charter dated Jun 1266[371]. "Maria comitissa de Viana domina de Grimberg et Perweis" confirmed a sale of property to Grimbergen by "Godefridus filius noster maior natu" with the consent of "uxoris suæ Aleydis", by charter dated 1278[372]. "Maria comitissa de Viana domina de Grimberge et Nivive et Godefridus filius noster maior natu" donated property to Grimbergen, with the consent of "Philippi fratris ipsius Godefridi", by charter dated 1280[373].
Philipp [I] & his wife had three children