This chapter explores the evolution of leadership thinking in response to shifting organisational demands and increasingly complex environments. Beginning with a historical overview of leadership, the chapter traces the development from traditional trait and behaviour-based models to more adaptive and relational paradigms. Emphasis is placed on how the volatility, uncertainty, complexity, and ambiguity (VUCA) of modern contexts have driven a reappraisal of what effective leadership looks like today. Through a critical examination of post-heroic and complexity-informed leadership theories, the chapter reveals how academic and practitioner understandings have moved beyond the myth of the individual leader to embrace collective sensemaking and organisational agility. This lays the foundation for interrogating the darker dimensions of leadership in subsequent chapters by asking not only what leadership is, but what it becomes under pressure, in flux, or when distorted by toxic dynamics.