The sun god and god of justice of Sumer was Utu (also known as Shamash). Brother of Inanna and Dumuzi just as Apollo was brother to Aphrodite and Dionysus, his description matches that of the Greek god Apollo. He was the law giver as well.
Celtic Crosses (the sun symbol of Utu-Shamash)
by Rita Jean Moran (www.thelibrarykids.com and www.hiddenhumanstory.com)