Zannanza

Zannanza (died c. 1324 BC) was a Hittite prince, son of Suppiluliuma I, king of the Hittites. He is best known for almost becoming the pharaoh of Egypt, but his disappearance under mysterious circumstances caused a diplomatic incident between the Hittites and Egyptian Empire, resulting in a war that ultimately resulted in the death of Suppliluliuma by an unknown plague and a long-lived rivalry between Egypt and the Hittites.

His disappearance is the earliest recorded case of a missing person.