Kingdom of Aragon
At its greatest territorial extension, the Kingdom of Aragon was made up of the territories that today form the Autonomous Community of Aragon, plus a large part of the current province of Lérida, most of the Ebro valley up to the sea, with Tortosa as the main coastal city, and the north of the current province of Castellón. This expansion was articulated through the creation of the Marquisates of Lérida and Tortosa, although they were later ceded by James I of Aragon to the Principality of Catalonia.