Henry I, Count of Vianden

Henry I of Vianden (* 1210, † 1252), known as the Sun King, was Count of Vianden and resided at the castle in Vianden. Under his rule, the county reached its greatest reputation. He also founded the Trinitarians in Vianden.

He is considered the " most enigmatic " figure from the home of the counts of Vianden. He was with Margaret Courtenay, Marchioness of Namur, married, a noble lady with imperial and royal ancestors. From her right he was from 1229 to 1237 also Count of Namur. This marriage is a sign of the high regard of the counts of Vianden. From 1248 to 1250 he participated in the the French king Louis side of the saints in the Sixth Crusade in part.

Henry was the father of the same name later bishop Heinrich, who built the Cathedral of Utrecht, and the uncle of the Archbishop Konrad von Hochstaden, which prompted the foundation stone of Cologne Cathedral. His daughter, Yolanda of Vianden was in early youth, against the will of the Father to the monastery and is revered to this day as blessed in Vianden.

After his death in 1264 was Vianden Luxembourg fief because of inheritance disputes.