The War of the 35 Years (also called the Byzantine-Ottoman War, the Tenth Crusade and even sometimes the First World War, was a war between Byzantium and the Ottoman Empire, and its respective allies. It occurred between the declaration of war given by the Ottomans toward Byzantium in January 15, 1685, and until the Peace of Bursa in April 10, 1720. Geo-politically, it was an extremely important war, both in the time and in the future, as the main cause for the UK-German strain in relationships and the start of the great decline of the Ottoman Empire, plus the creation of Italian dominance in the western Balkans and the Middle East.