The Cyrus Cylinder is an ancient clay cylinder, now broken into several pieces, on which is written a declaration in Akkadian cuneiform script in the name of Persia's Achaemenid king Cyrus the Great.[2][3] It dates from the 6th century BC and was discovered in the ruins of the ancient Mesopotamian city of Babylon (now in modern Iraq) in 1879.[2] It is currently in the possession of the British Museum, which sponsored the expedition that discovered the cylinder. It was created and used as a foundation deposit following the Persian conquest of Babylon in 539 BC, when the Neo-Babylonian Empire was invaded by Cyrus and incorporated into his Persian Empire.