This vessel was commissioned during the Romulans' long withdrawal from contact with the Federation, and Starfleet has only vague intelligence regarding the ship's date entering service. There are several possible dates, among them the year 2323 (Decipher RPG module: Starships), an unspecified year in the 2340s (ST reference: Starship Spotter)), and 2361 (Decipher RPG module: Starfleet Operations Manual). The D'deridex remained in active service in the 2370s decade outfitted as a battleship. (Decipher RPG module: Starships)