The Praetorian class was a type of dreadnought that was fielded by the Romulan Star Empire. Designed during the latter half of the 24th century it was slated to enter service with the Romulan Star Navy in 2379. It was only the second dreadnought design to be fielded by the Romulans during the 24th century. (Ship Recognition Manual, Volume 5: Starships of the Romulan Star Empire)
It was rumored among the ranks of the Tal Prai'ex that this class' name was just a codename given to the Norexan-class to hide it from the eyes of the Tal Shiar. (RIS Bouteina: "The Whole Kitten Kaboodle")