The Central Powers, also Central Empires, consisting of Germany, Austria-Hungary, the Ottoman Empire and Bulgaria - hence also known as the Quadruple Alliance was one of the two main coalitions that fought World War I (1914–18).
It faced and was defeated by the Allied Powers that had formed around the Triple Entente. The Powers' origin was the alliance of Germany and Austria-Hungary in 1879. Despite having nominally joined the Triple Alliance before, Italy did not take part in World War I on the side of the Central Powers; the Ottoman Empire and Bulgaria did not join until after World War I had begun, even though the Ottoman Empire had retained close relations with both Germany and Austria-Hungary since the beginning of the 20th century.
The members included German Empire, Austro-Hungarian Empire, the Ottoman Empire, Bulgaria and their territories. They were also supported by Azerbaijan and Finland, as well as Lithuania in 1918 and co-belligerent Jabal Shammar. They lost the war. The Allied Forces included Great Britain, Canada, Newfoundland, Russia, France, later the United States, Greece, Portugal, Brazil, Georgia, Armenia, Australia, Japan and Italy.