What is the significance of the date April 21 in relation to the Pantheon?

The date April 21 is significant in relation to the Pantheon because it marks the traditional date of Rome's foundation, believed to be 753 BCE. This date has been celebrated in ancient Roman traditions as Parilia, a festival that commemorates the founding of the city. The Pantheon, originally a temple to all the gods of Ancient Rome, connects deeply to Roman identity and history; thus, linking its significance to the foundation of Rome emphasizes the architectural and cultural heritage represented by this monumental structure.

While the Pantheon has ties to various emperors, including those who commissioned significant renovations, such as Hadrian during his reign, the specific association with April 21 directly relates to the foundational myths and historical significance of the city itself rather than a specific event concerning the building's construction or individual emperors' achievements.