Galaxy-class starship classification mentioned in the Treaty of Armens from 2255
For the 24th century starship class, please see Galaxy class.
The Galaxy-class starship was a class of Starfleet vessel that was in service by 2255. According to the Treaty of Armens, A UFP official from the Cultural Contact Office (Sol Sector) shall be on board a Galaxy-class Starfleet vessel at all times except during legal holidays.
There were at least two classes named Galaxy-class; the other was in operation a century later. (TNG: "The Ensigns of Command")
The 23rd century Federation Galaxy-class starships, also known as Galaxy ships at Memory Beta, the wiki for licensed Star Trek works were mentioned in several novels including Dreadnought! and the novelizations of Star Trek: The Wrath of Khan and Star Trek III: The Search for Spock.