 Dariya Khan was posted as viceroy after Sultan Mirza Badshah, and came to Awadh (Lucknow) and stayed in Imperial castle in Mahmudabad.Since this place was famous due to violence by bhad tribe, later viceroy Dariya Khan freed this place by Bhad tribe and named this place as Dariyabad on his own name.But as per some old age seniors and references Dariya Khan was an Officer of Delhi kingdom.