Question: In ancient Roman religion, Fontus or Fons (plural "Fontes", "Font" or "Source") was a god of wells and springs, a religious festival called the Fontinalia was held on October 13 in his honor, festivals in ancient Rome were an important part of Roman religious life during which eras, and one of the primary features of the Roman calendar?
Sentence (from "Roman festivals"): Festivals in ancient Rome were an important part of Roman religious life during both the Republican and Imperial eras, and one of the primary features of the Roman calendar.
Relevant evidence: Yes