Henry I, Count of Vianden
| Henry I | |
|---|---|
| Count Henry I of Vianden | |
| Reign | 1220–1252 |
| Marquis Henry III of Namur jure uxoris | |
| Reign | 1229–1237 |
| Born | c. 1190/1210 |
| Died | 1252 |
| Spouse | Margaret, Marchioness of Namur |
| Issue | Mathilde Philip I Henry I van Vianden Yolanda of Vianden Frederic of Vianden Peter |
| House | House of Sponheim/Vianden |
| Father | Frederic III, Count of Vianden |
| Mother | Mechthild (Mathilde) of Neuerburg |
Henry I, Count of Vianden and Marquis of Namur jure uxoris, born c. 1190/1210 (probably the earlier date), dead 1252.
Henry was the son of Frederic III, Count of Vianden (c. 1160 - 1210), and Mechthild (Mathilde) of Neuerburg (?), (b.c. 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 .
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. Margaret was the widow of Raoul, lord of Issoudun and thence Lady of Châteauneuf-sur-Cher and Mareuil-en-Berry. Margaret became Marchioness of Namur after the death of her brother Henry II, Marquis of Namur in 1229. 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). Baldwin sold Namur in c. 1263 to his cousin Guy of Dampierre, count of Flanders and Henry IV was removed by military force but they made peace with family marriage.
After Henry's death in 1252, Margaret entered a convent in Marienthal.
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