How often was the great sacrificial festival held at Uppsala?

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Germanic religion and mythology Battle scenes and ships depicted on a memorial stone from Gotland, Sweden, late 8th century. In the third panel from the top, a warrior is being hanged in a tree as a sacrifice to Odin, whose cult is represented by an eagle and a twisted knot.

According to the account provided by Adam of Bremen, the great sacrificial festival at Uppsala was held every nine years. During this event, both human and animal sacrifices were conducted in a sacred grove located beside the temple.1