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
Gulf of Ob Gulf of Ob The Gulf of Ob (also known as "Ob Bay") (, "Obskaya guba") is a bay of the Arctic Ocean, located in Northern Russia at the mouth of the Ob River. It is the world's longest estuary. The mouth of the Gulf of Ob is in the Kara Sea between the Gydan and Yamal peninsulas. It is about long and varies in width from about , and generally runs north and south. The gulf is relatively shallow, with an average depth from , which restricts heavy sea transport. The Taz Estuary is an eastern side-branch formed by the