In Star Wars lore, Ahsoka Tano has become one of the most pivotal figures in the saga after her shocking introduction in the pilot to Star Wars: The Clone Wars. She quickly grew into a favorite among fans, who appreciated how she humanized Anakin Skywalker as his apprentice. Now, Ahsoka's in the mainstream limelight after first appearing in The Mandalorian and then starring in her own TV series to detail what happened while searching for Ezra after Rebels. However, as important as she was to Anakin during the Clone Wars, Mike Chen's 2022 canon novel Star Wars: Brotherhood confirmed he had an apprentice before she came into his life.
Source:https://www.cbr.com/anakin-skywalker-mill-ailbeth-better-apprentice-than-ahsoka-star-wars/