Still, as political and economic fortune had passed elsewhere, the city went into a rapid decline, especially after the founding of the Abbasid capital at Baghdad in 760's, and soon became a ghost town. Caliph Al-Mansur took much of the required material for the construction of Baghdad from the ruins of Ctesiphon. He also attempted to demolish the palace and reuse its bricks for his own palace, but he desisted only when the undertaking proved too vast. Al-Mansur also used the al-Rumiya town as the Abbasid capital city for a few months.