Was trained basically from birth on how to be a knight. Most of her family had experience in the field of the sword, and Joan was no exception. She spent most of her life perfecting the sword, and was known by her speed and skill with her right arm. Her trainers constantly warned her about simply using a single arm, and asked her what she would do if it was injured. She never paid them any attention, and this would come back to haunt her.
She fought on the day of Hyrule Castle's destruction, and lost her family. She last called herself a knight of Hyrule when she was attempting to bring civilians to escape points. It was in that fighting that she was hit with a curse that should have rendered her unable to fight. It burned the right side of her body, and if she held a weapon in her right hand, the burns would automatically come back, causing intense pain. Unable to fight, she ran from the castle, becoming one of the few survivors.
Cursed and alone, she fled to Termina. There she trained to fight with her other hand, and even found a way to make the curse less of a burden. Even with these accomplishments, Joan has vowed never to return to the land she abandoned. She went as far as dropping her last name, and frequently lying about her past. Secretly, her wish she keeps locked in the farthest reaches of her heart, she wishes to one day go back to her homeland, and somehow regain the happiness she lost. Until then, she drowns her sorrows in alcohol, and wanders, looking for a purpose.