Wikipedia
Salaminia
The Salaminia was, along with Paralos, one of the two sacred triremes of the Athenian navy during the late 5th century BC. Frequently employed as a messenger ship, it played a notable role in several episodes of the Peloponnesian War.
The vessel was also used for special occasions, such as envoys to the oracle at Delphi and the conveyance of high-ranking Athenian statesmen, and as such only Athenian citizens were allowed to serve on it.