The Amman Citadel Inscription is the oldest known inscription in the so-called Ammonite language. It was discovered in 1961 in the Amman Citadel, and first published in full in 1968 by Siegfried Horn. The inscription is now in the Jordan Archaeological Museum. It is the third longest Semitic stone inscription ever found, after the Mesha Stele and the Siloam inscription.