Athanasia de Alger Obelia is the main protagonist of the manhwa "Who Made Me a Princess" as well as the first princess and only heir to the Obelian Empire. After reading a book named "The Lovely Princess" on a shunned princess named Athanasia, the protagonist falls asleep with sleeping pills and finds herself in the infant body of Athanasia from the book.

Athanasia, also known as "Athy", is the daughter of the emperor Claude de Alger Obelia and Diana, a dancer he deflowered after meeting at a royal banquet. Claude's harem previously occupied the Ruby Palace, however, he massacred them when Diana died giving birth to Athy.

Athy makes her goal in her new life to avoid the execution of the previous Athanasia on her 18th birthday.

(Source: Who Made Me Princess Wikia)

The story of Athanasia, forsaken princess of the Obelian Empire, ends with her execution at the hands of her own father—or does it? Her tragic tale is the plot of the novel The Lovely Princess. But now, a modern woman who read the book has just woken up as baby Athanasia herself, filled with her own memories and knowledge of the story she’s stuck in! Determined to survive her doomed fate, infant Athanasia embarks on this new life with a plan: avoid attention and hoard valuables to fund her escape. When her plan goes awry, she suddenly needs to charm her way into the good graces of her father, the beautiful tyrant emperor, so he doesn’t kill her again!
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(Source: Seven Seas Entertainment)