Athenian sacred ships were ancient Athenian ships, often triremes, which had special religious functions such as serving in sacred processions (theoria) or embassies or racing in boat races during religious festivals. The two most famous such ships were the Paralus and the Salaminia, which also served as the messenger ships of the Athenian government in the 5th and 4th centuries BC. Other notable ships included one possibly named the Delias, a triakonter (thirty-oared galley) believed to be the ship in which Theseus had sailed to Crete, and which was involved in several traditional theoria to Delos; the vessel was constantly repaired by replacing individual planks to keep it seaworthy while maintaining its identity as the same ship. (For the philosophical question of the ship's identity, s