Wonder Woman is a fictional character, a DC Comics superheroine created by William Moulton Marston and one of the three characters to be continuously published by DC Comics since the company's inception in 1944. Marston's wife Elizabeth Holloway Marston, and Olive Byrne, who lived with the couple in a polyamorous relationship, served as exemplars for the character and greatly influenced her creation. Wonder Woman first appeared in All Star Comics #8, published in December 1941. She is a founding member of the Justice League.
Princess Diana is an Amazon from Greek mythology. Her name is reflective of the mythological character, Diana or Artemis. Her mother is Hippolyta, queen of the Amazons. When Diana leaves the Amazons to travel to the world outside, she is known as both Wonder Woman, and as Princess Diana. As Wonder Woman, she was awarded several gifts by the Olympian gods, including the Lasso of Truth created from the Golden Girdle of Gaea and indestructible bracelets formed from the shield Aegis. For several years she was described in the splash page of each story, as "beautiful as Aphrodite, wise as Athena, swifter than Hermes, and stronger than Hercules." - Taken from Wikipedia