The pro-Lombard Monegario was succeeded in 764, by a pro-Byzantine Eraclean, Maurizio Galbaio. Galbaio's long reign (764-787) vaulted Venice forward to a place of prominence not just regionally but internationally and saw the most concerted effort yet to establish a dynasty. Maurizio oversaw the expansion of Venetia to the Rialto islands. He was succeeded by his equally long-reigning son, Giovanni. Giovanni clashed with Charlemagne over the slave trade and entered into a conflict with the Venetian church.