Iraq has been known by the Greek name Mesopotamia which means "(Land between the rivers)" and has been home to continuous successive civilizations since the 6th millennium BC. The region between the Euphrates and Tigris rivers is often referred to as the cradle of civilization and the birthplace of writing. Iraq was part of several empires, some were Safavid, and Afsharid. During the Mesopotamian Campaign of World War I, British Empire troops conquered the Ottoman Empire provinces of Basra and Baghdad and later added the province of Mosul to make Iraq.