"We left Rome on the Ides of January, on the last day of the Festival of the Nymphs"

Roman opus sectile mosaic panel - Hylas and the Nymphs
Public DomainRoman opus sectile mosaic panel - Hylas and the Nymphs - Credit: Marie-Lan Nguyen/Wikimedia Commons
This festival was the Carmentalia, held in honour of the nymph Carmenta, who could look into the past and the future. It was celebrated mainly by women. The Ides was a day in the calendar that marked the approximate middle of the month.

Head of a Nymph, by Sophie Gengembre Anderson
Public DomainHead of a Nymph, by Sophie Gengembre Anderson - Credit: Wikimedia Commons