Aprilis or
mensis Aprilis ("
April") was the fourth month of the ancient
Roman calendar, following
Martius (
March) and preceding
Maius ("
May"). On the oldest Roman calendar that had begun with March,
Aprilis was the second of ten months in the year. April had 29 days on calendars of the
Roman Republic, with a day added to the month during the reform in the mid-40s BC that produced the
Julian calendar.