Simon I, Duke of Lorraine

Simon I (1076–1139) ruled Upper Lorraine from 1115, succeeding his father Theodoric II. Through his mother he was a half-brother of Emperor Lothair III, and he continued the dynasty's alliance with the emperors, accompanying Henry V to the Diet of Worms in 1122 that settled the Investiture Controversy.

He clashed with the bishop of Metz and the archbishop of Trier, allies of the count of Bar. The archbishop excommunicated him until Pope Innocent II lifted the sentence.

A friend of Bernard of Clairvaux, he founded abbeys including Sturzelbronn in 1135, and was buried there. He was succeeded by his son Matthias.