Adalbert I of Saarbrücken (? - 23 June 1137) was the Archbishop of Mainz from 1111 until 1137. Adalbert was a son of Count Sigebert I of Saarbrücken. Adalbert supported Henry V against his father Emperor Henry IV, and on 14 February 1106 Adalbert is mentioned as being Henry V's chancellor. After the death of Ruthard, the Archbishop of Mainz, Adalbert was appointed the Archbishop in 1110 during the Investiture Controversy. It was not until the following year on the 15th of August that Adalbert received the mitre and staff, and not until 11 December that he was confirmed. The King and Pope Paschal II arranged a secret deal in February 1111 whereby the Emperor renounced the right of investiture of bishops and all invested bishops had to forfeit all rights, lands and privileges granted by the