A Puritan leader was an influential figure within the Puritan movement in the late 16th and 17th centuries, advocating for a reformation of the Church of England and the establishment of a society based on strict religious principles. These leaders played a crucial role in shaping early American colonies, particularly in New England, where they sought to create a 'city upon a hill' as a model of moral purity and community governance. Their vision influenced both religious practices and the societal structures that emerged in colonial America.