Ramiro fell in battle against the Saracens at the siege of Grados (1063), and his son Sancho Ramirez, a young prince full of energy, courage, and adventurous spirit, ascended the throne. He promptly turned his arms against the Moors. Having first wrested from them all the possessions they held in the mountainous districts of Aragon, Sobrarbe, and Ribagorza, he came down upon the fertile plains watered by the Cinca, Gallego, and other tributaries of the Ebro, and after a fierce engagement in which his ally, Count Ermengol of Urgel, lost his life (1065), took the important city of Barbastro which, though lost again a short time after, finally passed into the power of the Aragonese, and provided them with a favourably situated base for subsequent conquests. Soon afterwards King Sancho III of Navarre, the son of Garcia, was murdered at Peñalen by a band of conspirators headed by his ambitious brother Raymond and his sister Ermesenda (1076). As his children were not of age and the Navarrese refused to acknowledge the fratricide as their sovereign, the two kings Alfonso VI of Castile and Sancho Ramirez of Aragon marched into the neighbour kingdom, put Raymond to flight and divided the country between them; the country as far as the Ebro being united to Aragon, and Rioja, with Najera and Calahorra and the Basque provinces of Alava, Guipuzcoa, and Biscay falling to the share of Alfonso VI of Castile and Leon. [Sidenote: [1076-1109 A.D.]] Sancho then undertook a war of revenge against the emir Ahmed Muktadir of Saragossa, who had given shelter to the fugitive regicide Raymond. Having first seized some favourably situated places on the Ebro he advanced upon the city of Huesca, which, with the surrounding district, lay like a broad wedge driven into Aragonese territory, fortified with many strongholds and severing the north of his dominions from the south. In a war which lasted for several years and which was marked with every accompaniment of horror, the brave king succeeded in subjugating a large part of this district and making a safe road to the very walls of Huesca by a succession of skilfully planned fortifications. But he was not destined to witness the fall of the city; he received his death-wound in the siege from the enemy’s arrows (1094). His valiant son Pedro carried on with vigour and energy the work which his father had begun and urgently enjoined on him with his dying breath.