The Slave Dynasty ruled northern India from 1200-1290 CE. They were former slaves who rose to power. Key buildings from this period include the Qutub Minar, Quwwat-ul-Islam Mosque, Adhai Din Ka Jhonpra, and tombs of Iltutmish, Balban, and others. The Slave Dynasty made advances in architecture, using true arches for the first time in India in the tomb of Balban. The dynasty ended when the Khilji dynasty took power in 1290.