Adalbert of Mainz

Adalbert I
Archbishop of Mainz
Sketch of the seal of Adalbert on a falsified document from 1174-1211
ChurchCatholic Church
DioceseElectorate of Mainz
In office1111–1137
PredecessorRuthard
SuccessorAdalbert II
Personal details
DiedJune 23, 1137

Adalbert I von Saarbrücken (died June 23, 1137) 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 later Holy Roman Emperors to make concessions in order to maintain hereditary monarchy.