Henry I, Count of Vianden and Marquis of Namur jure uxoris, born c. 1190/1210, dead 1252.
Background
Henry was the son of Frederic III, Count of Vianden (de) (c 1160 - 1210), and Mechthild (Mathilde) of Neuerburg (?), (bc 1130/1170 - c 1200). At least his father married a Mechtild and another son, Frederick I, younger brother of Henry, inherited Neuerburg and married Cecilia of Isenburg, but that dynasty became extinct with the death of Frederick III of Neuerburg in 1332 (de). In 1216 Henry married Margaret, Marchioness of Namur, sometimes called "Sibilia" (c 1194 - 17 July 1270), daughter of Peter II of Courtenay and Yolanda of Flanders.
Career
Margaret was the widow of Raoul, lord of Issoudun and thence Lady of Châteauneuf-sur-Cher and Mareuil-en-Berry. Margaret and Henry ruled Namur (apparently as Henry III of Namur) until 1237 when they had to transfer Namur to Margaret"s brother, emperor Baldwin II of Courtenay. Henry and Margaret continued ruling Vianden.
Henry V, Count of Luxembourg (1216 – 1281), maternal grandson of Henry IV, Count of Luxembourg (Henry I of Namur), invaded Namur and ruled it 1256-1264 as Henry IV (or III).
After Henry"s death in 1252, Margaret entered a convent in Marienthal. Henry and Margaret had the following children:
Mathilde (c 1216 -), married around 1235 with Kaloioannes Angelos "Johann Angelus" (c 1193 - c 1255), Duke of Syrmia and Bacs.
They bore Maria Angelina (c 1235 - a 1285) whose husband Anseau de Cayeux or Chaurs worked for Charles of Anjou. Possibly they also bore Helen of Anjou (c 1236 – 1314), Queen consort of Serbia
Peter, dean in cathedrals of Liège and Cologne (died after 1272)
Frederic of Vianden.
Frederic died in 1247 (5 years before his father).
Henry I van Vianden (d 1267), bishop of Utrecht from 1249 to 1267. Philip I (d 1273), Count of Vianden 1252-1273. Their issue was Godefroid I, Count of Vianden (d 1307 or 1310) and four other children.
Yolanda of Vianden (1231–1283), still revered today in Luxembourg.
