During the Revolt of 1857, a person known as `Danka Shah` gained prominence. Option 1, Shah Mai, is not the correct answer as `Danka Shah` refers to a different person. Option 3, Nana Sahib, and option 4, Tantia Tope, are also not correct as `Danka Shah` does not refer to either of them. The correct answer is option 2, Maulavi Ahmadullah Shah.

Maulavi Ahmadullah Shah was a prominent figure during the Revolt of 1857. He was a Muslim cleric and military leader who played a crucial role in organizing and leading the rebellion in Bihar and Awadh. Maulavi Ahmadullah Shah was given the nickname `Danka Shah` because of his ability to rally and inspire the rebels with his powerful speeches and religious fervor. The term `Danka` refers to the sound of a drum, which signifies the call to action and unity. Thus, Maulavi Ahmadullah Shah was known as `Danka Shah` during the days of the Revolt of 1857.