Lausanne Treaty formally acknowledged the new League of Nations mandates in the Middle East, the cession of their territories on the Arabian Peninsula, and British sovereignty over Cyprus. The League of Nations granted Class A mandates for the French Mandate of Syria and Lebanon and British Mandate of Mesopotamia and Palestine, the latter comprising two autonomous regions: Mandate Palestine and the Emirate of Transjordan. Parts of the Ottoman Empire on the Arabian Peninsula became part of what is today Saudi Arabia and Yemen. The dissolution of the Ottoman Empire became a pivotal milestone in the creation of the modern Middle East, the result of which bore witness to the creation of new conflicts and hostilities in the region.