The "Azamgarh Proclamation" is historically significant because it is associated with the revolt of 1857 in India, which is often referred to as the First War of Independence. This proclamation was issued during the course of the rebellion and played a role in galvanizing and mobilizing support for the uprising against British colonial rule.The 1857 revolt was a major turning point in India's struggle for independence, and the Azamgarh Proclamation is an important historical document that sheds light on the motivations, grievances, and aspirations of those who participated in the rebellion. It provides insight into the context and events of the 1857 revolt and is considered a valuable source for understanding this pivotal moment in India's history.

 So, the correct option is [3].