and Torcello in the Venetian lagoon. The tribuni maiores formed the earliest central standing governing committee of the islands in the lagoon, dating from c. 568. The traditional first doge of Venice, Paolo Lucio Anafesto (Anafestus Paulicius), was elected in 697, as written in the oldest chronicle by John, deacon of Venice . Some modern historians claim Paolo Lucio Anafesto was actually the Exarch Paul, and Paul's successor, Marcello Tegalliano, was Paul's magister militum (or "general"), literally "master of soldiers". In 726 the soldiers and citizens of the exarchate rose in a rebellion over the iconoclastic controversy, at the urging of Pope Gregory II. The exarch, held responsible for the acts of his master, Byzantine Emperor Leo III, was murdered, and many officials were put to flight in the chaos. At about this time, the people of the lagoon elected their own independent leader for the first time, although the relationship of this to the uprisings is not clear. Ursus was the first of 117 "doges" (doge is the Venetian dialectal equivalent of the Latin dux ("leader"); the corresponding word in English is duke, in standard Italian duca. (See also "duce".) Whatever his original views, Ursus supported Emperor Leo III's successful military expedition to recover Ravenna, sending both men and ships. In recognition of this, Venice was "granted numerous privileges and concessions" and Ursus, who had personally taken the field, was confirmed by Leo as dux. and given the added title of hypatus (from the Greek for "consul"). In 751, the Lombard King Aistulf conquered most of the Exarchate of Ravenna, leaving Venice a lonely and increasingly autonomous Byzantine outpost. During this period, the seat of the local Byzantine governor (the "duke/dux", later "doge"), was at Malamocco. Settlement on the islands in the lagoon probably increased with the Lombard conquest of other Byzantine territories, as refugees sought asylum in the area. In 775/6, the episcopal seat of Olivolo (San Pietro di Castello, namely Helipolis) was created. During the reign of duke Agnello Particiaco (811–827) the ducal seat moved from Malamocco to the more protected Rialto, within present-day Venice. The monastery of St. Zachary and the first ducal palace and basilica of St. Mark, as well as a walled defense (civitatis murus) between Olivolo and Rialto, were subsequently built here. Charlemagne sought to subdue the city to his rule. He ordered the pope to expel the Venetians from the Pentapolis along