What Empire was Istanbul the capital

Ottoman Empire. The city, known alternatively in Ottoman Turkish as Ḳosṭanṭīnīye (قسطنطينيه‎ after the Arabic form al-Qusṭanṭīniyyah القسطنطينية‎) or Istanbul (while its Christian minorities continued to name it Constantinople), was the capital of the Ottoman Empire from its conquest in 1453 until the empire's collapse in 1922.

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answer; legislature;