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The temple of Summanus, the god of nocturnal thunder, was dedicated during the Pyrrhic War c. 278 BCE on June 20. It was located west of the Circus Maximus, possibly on the slope of the Aventine.

The day before the summer solstice, summanalia (round, wheel-shaped cakes of flour, milk and honey) were offered to appease him. In keeping with the Roman practice of giving a dark offering to gods of the underworld, Summanus also received a sacrifice of two black oxen.