Historical accounts make mention of clay from Mecca being used in the construction procedure and the replacement of an inward gallows with an Islamic mosque.

Nawab Mustafa Khan Shefta was a close friend, admirer and, in times of need, a patron of Mirza Ghalib – who was a classical Urdu and Persian poet from India during British colonial rule.

Even after the surrender of the Mughal army, Ismail Baig continued his fight for liberation against the British and, as a result, retreated to Nepal.

The family, that had been previously based in Delhi and Jehangirabad, had established Mustafa Castle as its main home after the building's completion in the year 1900.

It was during Nawab M. Ismail Khan's career in the national struggle [1918–1958] that Mustafa Castle was markedly transformed into a hub of political activity.

Nawab M. Ismail Khan was a highly accomplished politician and an independent activist of the Indian Subcontinent who presided as Chairman over the All-India Muslim League in the state of Uttar Pradesh [United Provinces].

In general, it was Nawab Mohammad Ismail Khan who transformed his home, Mustafa Castle, into a haven for political proceedings during his reign.

Albeit Nawab M. Ismail Khan is one of the founding fathers of Pakistan, he never migrated towards the 'promising land' due to his steadfast commitment towards the thousands of Muslims left behind in India itself.