The first general study of Peter Lombard (c. 1100-1160) in a century, this book places Peter's thought in the context of the intellectual debates of his time in the effort to understand the substance of Lombardian theology and the reasons why his principal work, the Sentences, immediately became a classic of early scholastic theology with a durable influence, doing more to shape the education of university theologians and philosophers than any other work of systematic theology for the next four centuries. Attention is paid to the sentence collection as a genre of theological literature, the problem of theological language with which Peter and his contemporaries wrestled, and his contribution to early scholastic biblical exegesis as well as to the development of his systematic theology in the Sentences.