This book reconstructs the pre-Julian calendar of Rome on the basis of epigraphical and literary evidence, and analyzes its relation to the solar and lunar years. Mrs. Michels shows how the varied contents of the calendar were related to the political as well as to the religious life of Rome of the first century B.C. She traces the history of the calendar back to the fifth century, indicating the stages by which a single list of festivals may have developed into the complex document of the late republic. The Roman method of intercalation, the character of the days, and the history of the trinum nundinum are presented in appendices. Originally published in 1967. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.