Around 713 BC, the semi-mythical successor of Romulus, King Numa Pompilius, is supposed to have added the months of January and February, so that the calendar covered a standard lunar year (354 days).
Sekitar 713 SM, penerus sebagian mitos Romulus, Raja Numa Pompilius, seharusnya telah menambahkan bulan Januari, dan Februari, memungkinkan penanggalan tersebut sama dengan tahun lunar standar (354 hari).