This introductory chapter gives a broad overview of the book’s contents and explains why acknowledging C.S. Lewis’s Irishness fundamentally affects the ways in which we interpret his works and his life. Lewis’s anti-colonialism and his ecumenism resonate differently when we realize that he was born and raised in “metrocolonial” Ireland and, more specifically, in sectarian Belfast. Likewise, when we see Lewis engage with Irish mythology or the highly Hibernian, Revivalist work of Irish writers such as W.B. Yeats and James Stephens—as he so often does—it is important to recognize that this is an example of Lewis plugging into the culture of his own native country, not fetishizing an “exotic” country. Lewis being Irish also affects how we view the English and Irish characters in his fiction. Fully acknowledging Lewis’s Irish identity also helps us to make more sense of key aspects of his biography—and that, in turn, affects our biographical readings of his writings.