History of the Republic of Venice of the Sea" ceremony was established in this period. Orseolo died in 1008. Venice's control over the Adriatic was strengthened by an expedition by Pietro's son Ottone in 1017, by which time Venice had assumed a key role in balancing power between the Byzantine and Holy Roman Empires. During the long Investiture Controversy, an 11th-century dispute between Henry IV, Holy Roman Emperor and Pope Gregory VII over who would control appointments of church officials, Venice remained neutral, and this caused some attrition of support from the Popes. Doge Domenico Selvo intervened in the war between the Normans of Apulia and
Fall of the Republic of Venice empire, in return for French possession of the Austrian Netherlands. On the same day, however, events precipitated themselves at Verona. The population, and a part of the Venetian troops quartered there, tired of French arrogance and oppression, rose in revolt. The episode, known as the "Veronese Easter", quickly reduced the occupation troops to the defensive, reducing them to the city's forts. On 20 April, although the ban on foreign warships entering the Lagoon of Venice had recently been reiterated, the French frigate "Le Libérateur d'Italie" ("Italy's Liberator") tried to enter the Porto di Lido, the northern entry to the Lagoon.