Alexander I (called "of Jülich"; , ) was the prince-bishop of Liège from 1128 to 1134. As bishop, he received Pope Innocent II, Emperor Lothair II, and Bernard of Clairvaux. As prince, he was a warrior, taking part in the wars of Waleran, Duke of Lower Lorraine against Godfrey I of Leuven. Sources 12th-century Prince-Bishops of Liège 1134 deaths Prince-Bishops of Liège Year of birth unknown