He served as an apostolic legate to the Holy Land in 1102 in the aftermath of the First Crusade, during a critical period in the formation of the Kingdom of Jerusalem.
[3] In 1102, Robert was sent to the Holy Land as an apostolic legate to replace the late Cardinal Maurice of Porto.
On 8 October 1102, he formally deposed the patriarch of Jerusalem, Dagobert, on charges of murder, treason and embezzlement.
[2] On account of his strong opposition to any compromise with the emperor, Paschal deposed him (along with Gregory of Santi Apostoli) in 1112 on the charge of heresy.
He was only restored in 1119 after writing a letter to the new pope, Calixtus II, congratulating him on his election and asking to have the stain of heresy removed.