 The title of Haseki Sultan, was created for her and was used by her successors.Kösem Sultan was also one of the most powerful women in Ottoman history.Kösem Sultan achieved power and influenced the politics of the Ottoman Empire when she became Haseki Sultan as favourite consort and later legal wife of Ottoman Sultan Ahmed I (r. 1603–1617) and Valide Sultan as mother of Murad IV (r. 1623–1640) and Ibrahim (r. 1640–1648), and grandmother of Mehmed IV (r. 1648–1687).