Muhammad Ghori established himself as strong ruler with his empire extending over Afghanistan, Pakistan, and northern India. Qutb-ud-din Aibak crowned himself the Sultan of Delhi in 1206, when Muhammad Ghori was killed on the battlefield. After his death, when Aibak came to the throne, he ruled over those places where he was appointed as the local receiver-general of Sultan Ghori. Despite the rebellions by nobles like Taj-ud-din Ildiz and Nasir-ud-din Qubachah, he strengthened the administrative system, which had been established by ghori