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 Mersin Gulf of Mersin Gulf of Mersin () is one of the widest gulfs in Turkey. It is in the northeast of the Levantine Sea between the gulfs of İskenderun and Antalya. ( The Levantine Sea is the easternmost part of the Mediterranean Sea.) The gulf of Mersin is between Taşucu in the west and Karataş in the east. The total distance between these two points is approximately 115 km. ( ≈ 71 mi or 62 nmi). The city of Mersin is roughly at the center of the coastline. The total water surface is about 2 300 km ( ≈ 888