Adalbert of Mainz, German archbishop

Adalbert I of Mainz

German Catholic cleric (died 1137)

Adalbert I von Saarbrücken was Archbishop-Elector of Mainz from 1111 until his death. He played a key role in opposing Henry V, Holy Roman Emperor, during the Investiture Controversy, and secured the election of Lothair III rather than Henry V's chosen heir in 1125, causing…