Part I investigates a wide range of autobiographies, alongside work on the history and literary criticism of autobiography, on narrative, and on the philosophies of the self and of the good life. It works from the point of view of the autobiographer, and considers what she does, what she aims at, and how she achieves her effects, to answer three questions: what is an autobiography? How can we learn about ourselves from reading one? About what subjects does autobiography teach? This part of the book develops, first, an account of autobiography as paradigmatically a narrative artefact in a genre defined by its form: particular diachronic compositional self-reflection. Second, an account of narrative as paradigmatically a generic telling of a connected temporal sequence of particular actions taken by, and particular events which happen to, agents. It defends rationalism about autobiography: autobiography is in itself a distinctive and valuable form of ethical reasoning, and not merely involved in reasoning of other, more familiar kinds. It distinguishes two purposes of autobiography, self-investigation and self-presentation. It identifies five kinds of self-knowledge at which autobiographical self-investigation typically aims—explanation, justification, self-enjoyment, selfhood, and good life—and argues that meaning is not a distinct sixth kind. It then focusses on the book’s two main concerns, selfhood and good life: it sets out the wide range of existing accounts, taxonomies, and tasks for each, and gives an initial characterisation of the self-realization account of the self and its good which is defended in Part II.