Dagobert arrived with the Pisan fleet that had come to help the Crusaders besiege the towns along the Mediterranean coast in 1100. He had been appointed by Pope Paschal II, and replaced the temporary patriarch, a Norman priest named Arnulf of Chocques. Dagobert wanted the Kingdom of Jerusalem to be a theocracy, with the Pope at its head, and the Patriarch as the Pope's representative. Godfrey of Bouillon, the first king, promised to turn over the crown to the Papacy once the Crusaders conquered Egypt, which would then become a secular kingdom to replace Jerusalem. However, the invasion of Egypt never came, and Godfrey soon died, while Dagobert was with the army besieging Jaffa. Dagobert attempted to claim Jerusalem for himself, but the nobles took advantage of his absence and proclaimed Godfrey's brother Baldwin of Boulogne as the new king. Upon his return, Dagobert reluctantly crowned Baldwin in Bethlehem, as he refused to crown the new king in Jerusalem itself. Baldwin frequently quarrelled with Dagobert, and in 1102 when Dagobert went to Rome to report to the Pope, Baldwin briefly replaced him with a much more compliant Patriarch, a minor priest named Ehremar. However, Ehremar was quickly deposed when Dagobert returned.
Dagobert remained Patriarch until his death in 1107, and was succeeded by Ghibellin of Arles.
The revenue and jurisdiction of the lawful patriarch were usurped by the Latin clergy: the exclusion of the Greeks and Syrians was justified by the reproach of heresy or schism; and, under the iron yoke of their deliverers, the Oriental Christians regretted the tolerating government of the Arabian caliphs.
Daimbert, archbishop of Pisa, had long been trained in the secret policy of Rome: he brought a fleet at his countrymen to the succor of the Holy Land, and was installed, without a competitor, the spiritual and temporal head of the church.
After the reduction of the maritime cities of Laodicea, Tripoli, Tyre, and Ascalon, which were powerfully assisted by the fleets of Venice, Genoa, and Pisa, and even of Flanders and Norway, the range of sea-coast from Scanderoon to the borders of Egypt was possessed by the Christian pilgrims.
Daimbert was with Tancred and the army, marching on Jaffa and Acre.
Daimbert claimed that he was the true ruler of Jerusalem, in the name of the papacy, but the nobles chose to treat Jerusalem as a hereditary fief and so it naturally fell to the next of kin.
Daimbert rushed back to Jerusalem as soon as he heard the news, but by then it was too late.