According to Lesley Adkins and Roy A. Adkins in their Handbook to life in Ancient Rome, "The Amburbium was a movable festival that appears to have been held sometime in February to purify the city of Rome. It seems to have involved a procession around the city, accompanied by prayers and sacrifices."

Amble Around the Urbs

Urbs septicollis, or
Rome as we know it in
English these days,
Yearly was purified
Walking around it and
Praying it stays.

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