Kingdom of Aragon
In 1035 Ramiro, natural son of Sancho III of Navarre and baiulus of the county of Aragon, incorporated the counties of Sobrarbe and Ribagorza, which had been under the rule of his brother Gonzalo, into the county. After Sancho's death, the county split from the kingdom of Navarre and was constituted as a separate kingdom, although under the tutelage of the Navarrese kingdom governed by his brother García Sánchez III. Limited to the Pyrenean valleys and neighboring the more powerful kingdom of Navarre and the important Taifa of Saragossa, the increase in population and the thirst for land for its inhabitants impelled it to expand, despite its initial military weakness.