The Roman Calendar used Ides to designate the middle of the month for May, July and October. During the month, not only did the dates always fall on the 15th, but the full moon would also appear ...

When King Pompilius revamped the Roman calendar around 690 B.C., he named January after Janus, the Roman god of doors and beginnings. Seems appropriate for the first month of the new year.

In fact, so determined was he to reboot Rome's broken calendar that he ordered 46 B.C. (ever since commemorated as "the longest year in history") to be elongated to 445 days to force the calendar ...

French Republican Calendar Ancient Roman Calendar Today, most of the West uses the Gregorian calendar, which has its roots in two earlier calendar systems: the Julian calendar and the Roman calendar.

Julius Caesar in 45 B.C. adjusted the Roman calendar, which had been thrown into chaos by the time he came into power. Select an option below to continue reading this premium story.

"The Roman calendar actually used to start two months later, so it used to start in March," Gallia said. "So therefore, if you do the math, it works out that October would be the eighth month ...

VATICAN CITY — Pope Francis on Tuesday added the memorial of Sts. Mary, Martha, and Lazarus to the General Roman Calendar, giving the siblings the combined feast day of July 29.

Every March 15, the dark history behind the 74th day in the Roman calendar has led many to think of bad omens and doom -- but the day has a deep history and purpose.