Ghazi-ud-Din Haidar Shah (Hindi: ग़ाज़िउद्दीन हैदर शाह Urdu:غازی الدیں حیدر شاہ) (b. c. 1769 – d. 19 October 1827) was the lastnawab wazir of Oudh from 11 July 1814 to 19 October 1818 and firstKing of Oudh from 19 October 1818 to 19 October 1827.

He was the third son of Nawab Saadat Ali Khan and Mushir Zadi was his mother. He became Nawab Wazir of Oudh on 11 July 1814 after the death of his father. In 1818, under the influence of Warren Hastings, the British Governor of the Presidency of Fort William (Bengal), he declared himself as the independent Padshah-i-Awadh (King of Oudh). He died in the Farhat Bakhsh palace in Lucknow in 1827. He was succeeded by his son Nasir-ud-Din Haider after his death.

Several monuments in Lucknow were constructed by Ghazi-ud-Din Haidar. He built the Chattar Manzil palace and added the Mubarak Manzil and the Shah Manzil in the Moti Mahal complex for better viewing of the animal fights. He also constructed the tombs of his parents, Sadat Ali Khan and Mushir Zadi Begum. For his European wife, he constructed a European style building known as the Vilayati Bagh. Another creation, the Shah Najaf Imambara (1816), his mausoleum, on the bank of the Gomti is a copy of the fourth Caliph Ali’s burial place in Najaf, Iraq. His three wives, Sarfaraz Mahal, Mubarak Mahal and Mumtaz Mahal were also buried here.

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