It was established as one of the twelve original Subahs (top-level imperial provinces) under 16th-century Mughal emperor Akbar and became a hereditary tributary polity around 1722 AD, with Faizabad as its initial capital and Saadat Ali Khan as its first Subadar Nawab and progenitor of a dynasty of Nawabs of Awadh (often styled Nawab Wazir al-Mamalik). The traditional capital of Awadh was Faizabad, but the capital was later moved to Lucknow, also the station of the British Resident, which now is the capital of Uttar Pradesh. Nepalgunj now is the capital of Nepal.
History of Awadh :-
Awadh, known as the granary of India, was important strategically for the control of the Doab, a fertile plain between the Ganges and the Yamuna rivers. It was a wealthy kingdom, able to maintain its independence against threats from the Marathas, the British and the Afghans.
Awadh under the Mughals :-
From the pre-historic period to the time of Akbar, the limits of the subah (imperial top-level province) and its internal divisions seem to have been constantly changing, and the name of Oudh, or Awadh, seems to have been applicable to only one of the ancient divisions or Sarkars, nearly corresponding to old
Khan Zaman Khan Ali Asghar son of Qazi Ghulam Mustafa was appointed as Subahdar of Awadh during the reign of Farrukhsiyar. This appointment was made in place of 'Aziz Khan Chughtai'. Later on, Mahabat Khan was appointed as Subahdar of Awadh in place of Khan Zaman Khan Ali Asghar, who was all over again transferred to Azimabad (Patna) as Subahdar in place of 'Sar Buland Khan'.
Nawabs of Awadh :-
As the Mughal power declined and the emperors lost their paramountcy and they became first the puppets and then the prisoners of their feudatories, so Awadh grew stronger and more independent. Its capital city was Faizabad. Saadat Khan, the first Nawab of Awadh, laid the foundation of Faizabad at the outskirt of ancient city of Ayodhya. Faizabad developed as a township during the reign of Safdar Jang, the second nawab of Avadh (1739–54), who made it his military headquarters while his successor Shuja-ud-daula made it a full-fledged capital city. Suja-ud-daula, the third Nawab of Awadh, built a fort known as Chhota Calcutta, now in ruins. In 1765 he built the Chowk and Tirpaulia and subsequently laid out the Anguribagh and Motibagh to the south of it, Asafbagh and Bulandbagh to the west of the city. During the reign of Shuja-ud-daula, Faizabad attained such a prosperity which it never saw again. The Nawabs graced Faizabad with several beautiful buildings, notable among them being the Gulab Bari, Moti Mahal and the tomb of Bahu Begum. Gulam Bari is a striking building of fine properties, standing in a garden surrounded by a wall, approachable through two large gateways. Pachhimrath.
Saadat Khan Burhanul Mulk was appointed Nawab in 1722 and established his court in Faizabad near Lucknow. He took advantage of a weakening Mughal Empire inDelhi to lay the foundation of the Awadh dynasty. His successor was Safdarjung the very influential noble at the Mughal court in Delhi. Until 1819, Awadh was a province of the Mughal Empire administered by a Nawab.