Decemvir

noun

1. One of a body of ten Roman magistrates, especially a member of one of two such bodies appointed in 451 and 450 BC to draw up a code of laws.
2. One of an authoritative body of ten.
3. One of the ten men, or decemviri, the title of four differently constituted bodies in ancient Rome.
4. By extension, one of any official body of men, ten in number. as the old Council of Ten in Venice.
5. One of a body of ten magistrates in ancient Rome.