The Vitulatio was an annual thanksgiving celebrated in ancient Rome on July 8, the day after the "Nonae Caprotinae" and following the Poplifugia on July 5. The Poplifugia is a lesser-known festival that was of obscure origin even for the Romans themselves; Macrobius says that it marked a Roman retreat from the Etruscans at Fidenae during the Gallic invasion, and that the Vitulatio commemorated their comeback victory. It was a "dies religiosus," a day of religious prohibition when people were to refrain from undertaking any activity other than attending to basic necessities.