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 Tonkin major escalation of the Vietnam War in South Vietnam, which began with the landing of US regular combat troops at Da Nang in 1965. Gulf of Tonkin The Gulf of Tonkin (, ; also ) is a body of water located off the coast of northern Vietnam and southern China. It is a northern arm of the South China Sea. The Gulf is defined in the west by the northern coastline of Vietnam, in the north by China's Guangxi province, and to the east by China's Leizhou Peninsula and Hainan Island. The bay's Vietnamese and Chinese names – and ,