Mathilde de Vianden

-http://fmg.ac/Projects/MedLands/LUXEMBOURG.htm#MathildeViandenMIoan...

d) MATHILDE . Her parentage and marriage are confirmed by the dispensation issued by Pope Innocent IV for the marriage of "Anselmum de Keu ac Mariam natam Matildis dominæ de Posaga, natæ comitissæ Viennensis" dated 15 Aug 1253, and the marriage licence for "Maria, nate quondam Calojohanni" dated 13 Jan 1254, the documents naming "imperatore Constantinopolitano, eiusdem Matildis avunculo"[655].

m IOANNES "Kaloioannes" Angelos, son of Emperor ISAAKIOS III & his second wife Margit of Hungary (-after 1240).