Marcus Aemilius Lepidus
Consul with Julius Caesar in 46 BCE, the last year of the old calendar.
How the Romans fixed the year
Censorinus, On the Birthday 20–22 (238 CE), in the edition of Friedrich Hultsch (Leipzig, 1867) · 238 CE
adeo aberratum est ut G. Caesar pontifex maximus suo III et M. Aemilii Lepidi consulatu, quo retro delictum corrigeret, duos menses intercalarios dierum LXVII in mensem Novembrem et Decembrem interponeret, cum iam mense Februario dies III et XX intercalasset, faceretque eum annum dierum CCCCXLV, simul providens in futurum ne iterum erraretur: nam intercalario mense sublato annum civilem ad solis cursum formavit.
Things went so far wrong that Gaius Caesar, as chief pontiff, set out to correct the past error. In the year when he was consul for the third time, with Marcus Aemilius Lepidus, he put two extra months, of 67 days in all, between November and December. He had already inserted 23 days in February, and so he made that year 445 days long. At the same time he made sure the error would not happen again. He did away with the extra month and shaped the civil year to the course of the sun.