The cylinder of Cyrus or the charter of Cyrus is a tablet of baked clay that was written in 538 BC by the order of Cyrus the Great Achaemenid. This cylinder is kept in the British Museum and parts of it are broken and missing. Another version of the text of the cylinder was found on two pieces of clay tablets, which are also in the Babylonian collection of the British Museum and are considered to be the remnants of the archived version of the same cylinder.