The Minotaur was a real mythological creature on ancient calendars - Apparently.
In ancient Greece, the Minotaur, half-man half-bull, was featured on the Athenian calendar for the festival of the Greater Dionysia, held in honor of Dionysus, the god of wine and fertility. This festival, which included theater performances and animal sacrifices, was celebrated in March of each year. The Minotaur's appearance on the calendar is mentioned in the 5th-century BCE Athenian calendar, making it a verified part of ancient Greek mythology.