What is "maponos"

In ancient Celtic religion, Maponos or Maponus ("Great Son") is a god of youth known mainly in northern Britain but also in Gaul. In Roman times he was equated with Apollo.

The Welsh mythological figure Mabon ap Modron is apparently derived from Maponos, who by analogy we may suggest was the son of the mother-goddess Dea Matrona. The Irish god Aengus, also known as the Mac Óg ("young son"), is probably related to Maponos, as are the Arthurian characters Mabuz and Mabonagrain.