The historical capital was Benabarre. However, Barbastro has taken precedence as the main center of the area. Benabarre (Catalan Benavarri) is a town of the comarca of Baja Ribagorza (Catalan Baixa Ribagorça) in the province of Huesca, Aragon, Spain. ...
The original kingdom of Aragon (formed by the counties of Aragon, Sobrarbe and Ribagorza) was progressively expanded from the mountain ranges towards the South, pushing the Moors further South in the Reconquista and spreading the Aragonese language.
The annexation of the Catalan Counties by the Aragonese Crown meant that these territories were linguistically heterogeneous, with Catalan spoken in the eastern region, and Aragonese in the west.
Nowadays, Aragonese is still spoken natively within its core area, the Aragonese mountain ranges of the Pyrenees, in the comarcas of Somontano, Sobrarbe, and Ribagorza.