BEWARE THE IDES OF MARCH JULIUS CEASAR EID MAR (Eidibus Martiis – on the Ides of March) But the Ides of March actually has a non-threatening origin story. Kalends, Nones and Ides were ancient markers used to reference dates in relation to lunar phases. Ides simply referred to the first full moon of a given month, which usually fell between the 13th and 15th. In fact, the Ides of March once signified the new year, which meant celebrations and rejoicing… ← YESTERDAY'S FACE TOMORROW'S FACE →