Ptolemy IV Philopator
The Greek author Athenaeus of Naucratis (V 204c-d) reports something that may have been a dry dock in Ptolemaic Egypt in the reign of Ptolemy IV Philopator (221-204 BC) on the occasion of the launch of the enormous "Tessarakonteres" rowing ship. However a more recent survey by Goodchild and Forbes does not substantiate its existence.