What is "belenus"

Belenus (also Belenos, Belinus, Bel, Beli Mawr) is a Sun God from Celtic Mythology and, in the third century, the patron deity of the Italian city of Aquileia. Called the "Fair Shining One," (or The Shining God) he was one of the most ancient and most widely worshiped Celtic deities and is associated with the ancient fire festival and modern Sabbat Beltane. He was associated with the horse (as shown by the clay horse figurine offerings at Belenos’ Sainte-Sabine shrine in Burgundy) and also the Wheel. Perhaps like Apollo - with whom he became identified in the Augustan History - Belenos was thought to ride the Sun across the sky in a horse-drawn chariot.