Here we have it, the final entry in our Aquaman week. But the last is far from least!
Aquaman, like Wonder Woman already had an origin story from back in 1941. However, to bring him up to speed, the good folks at DC felt he needed a little "tweak". The following origin story was drawn by the absolutely incredible Ramona Fradon. Unfortunately, the writer's name is lost to time and uncertainty. From Adventure Comics #260, May 1959 here's "How Aquaman Got His Powers"
But wait! Apparently the Sea King was so awesome he warranted another telling of his origin a scant two years later. This time, the Atlantean angle is expanded upon and we learn more of Arthur's mother, Atlanna. From Showcase #30, January- Februay 1961 here's an excerpt from "The Creatures From Atlantis" by Jack Miller, with more art by the dazzling Ramona Fradon.