The "Diana Prince" identity has been part of Wonder Woman's history since her comics debut in 1941. In the early Golden Age stories, Wonder Woman served as a military secretary during World War II, using Prince as her cover. Later occupations Wonder Woman performed as Prince included translator at the United Nations, Air Force captain and ambassador, and in the '70s TV series, Lynda Carter's Wonder Woman used Prince to serve as an agent of the Inter-Agency Defense Command. In the DC Extended Universe, Prince works as curator for the Department of Antiquities at the extremely prestigious Louvre Museum and is held in very high esteem by the curator of the Gotham City Museum of Antiquities. Her tremendously long life span, accumulation of immense amount of knowledge and exceptional perceptiveness makes Diana Prince the wisest and most emotionally-intelligent member of the Justice League.
In the Golden Age, Wonder Woman adhered to an Amazon code of helping any in need, even misogynistic people, and never accepting a reward for saving someone; while conversely, the modern version of the character has been shown to perform lethal and fatal actions when left with no other alternative, exemplified in the killing of Maxwell Lord in order to save Superman's life.
“Noted Psychologist Revealed as Author of Best-Selling ‘Wonder Woman,’” read the astonishing headline. In the summer of 1942, a press release from the New York offices of All-American Comics turned up at newspapers, magazines and radio stations all over the United States. The identity of Wonder Woman’s creator had been “at first kept secret,” it said, but the time had come to make a shocking announcement: “the author of ‘Wonder Woman’ is Dr. William Moulton Marston, internationally famous psychologist.” The truth about Wonder Woman had come out at last.
Gaines decided he needed another expert. He turned to Lauretta Bender, an associate professor of psychiatry at New York University’s medical school and a senior psychiatrist at Bellevue Hospital, where she was director of the children’s ward, an expert on aggression. She’d long been interested in comics but her interest had grown in 1940, after her husband, Paul Schilder, was killed by a car while walking home from visiting Bender and their 8-day-old daughter in the hospital. Bender, left with three children under the age of 3, soon became painfully interested in studying how children cope with trauma. In 1940, she conducted a study with Reginald Lourie, a medical resident under her supervision, investigating the effect of comics on four children brought to Bellevue Hospital for behavioral problems. Tessie, 12, had witnessed her father, a convicted murderer, kill himself. She insisted on calling herself Shiera, after a comic-book girl who is always rescued at the last minute by the Flash. Kenneth, 11, had been raped. He was frantic unless medicated or “wearing a Superman cape.” He felt safe in it—he could fly away if he wanted to—and “he felt that the cape protected him from an assault.” Bender and Lourie concluded the comic books were “the folklore of this age,” and worked, culturally, the same way fables and fairy tales did.
The Crime Syndicate imprisoned the Justice Leagues inside the Firestorm Matrix which psychologically placed them in situations that depicted their greatest failures. Wonder Woman was placed in a situation where she was forced to do battle against both Amazons and humans for the lives of Superman and Steve Trevor. Martian Manhunter and Stargirl attempted to break her out but Wonder Woman ignored them.
When a Godwave spilled forth from the creation of the Fourth World, the Earth was seeded with great power. It first manifested in the form of old gods, then of metahumans. Some of the oldest of these gods were hidden from the universe until the time of ancient Greece by the sorceress, Hecate. Hecate reasoned that the Olympian Gods (as they would eventually be called) were greatly weakened after usurping power from their father Cronus and the Titans of Myth. She feared that other powerful gods in the universe (notably Darkseid of Apokolips) would seize Earth for himself. Because of Hecate's enchantment, Darkseid wrongly believed that he and the other New Gods pre-dated the Olympians.
Following the events of Infinite Crisis, she disappeared for a year in order to rediscover herself, and took part briefly in the events of 52. In the span of One Year Later, she was re-imagined once again and was forgiven by Batman and Superman while given her third ongoing monthly title. Batman helped her establish a role at the Department of Metahuman Affairs under the name of Diana Prince (paying homage to her golden age alter ego.) She worked alongside Tom Tresser and eventually became romantically involved with him. A move among fans across the different companies occurred with characters reverting to their original numbering of series (this for instance happened to Iron Man at Marvel as well) and the third Wonder Woman series was relaunched with Wonder Woman #600. This was actually accurate at the time as it was the indeed the 600 issue released (not including issues numbered otherwise such as with a zero or a million). Issue 600 was used as a chance to reinvent the character as she discovers herself with no memories and in a new costume. This was a short lived experiment as the entire DC lineup was soon to be re-imagined into the new 52, though certain aspects of her redesigned costume remained.