Tongoenabiagus

Tongoenabiagus was the god of the Fonte do Ídolo (Portuguese for Fountain of the Idol), a 1st-century shrine in Braga (the Roman Bracara Augusta) with an inscribed fountain dedicated both to Tongoenabiagus and the goddess Nabia.

His name may derive from the Celtic root *tenge(o)- (Old Irish tongu "I swear") and so he may have been associated with the swearing of oaths.

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The Fonte do Ídolo , in Braga.