In this work, we addressed the epistemology of Leadership styles and supporting theories, providing a new perspective on the emerging themes after careful analysis and revision. From examining 37 leadership supporting theories, and 120 leadership styles, themes relating to the nature of Leadership emerged from the analysis, such as "cognitive" or "behavioral;" "situational" or "transformational;" "eye-to-eye" or "remote," and from the literature review, such as "informal or formal," "small groups" or "organizations," and leaders. As a result, we believe it is possible to reduce somehow the confusion that has contaminated leadership research for more than a century, paving the way for future research by understanding complex concepts affecting Leadership over the centuries.