Ancient sources cite the 10th day of the month of Gamelion as the day of Epicurus' birth.  As such, he held a feast in his Garden, and later when his hero cult evolved he was celebrated on that day. The month of Gamelion is the month of marriage (gamos), situated in the latter part of January and the early part of February.  It doesn't fit exactly into our calendar because the Attic calendar in u…