Yaddle was a Force-sensitive female being of the same species as Grand Master Yoda and Grogu, was a Jedi Master and member of the Jedi High Council during the last years of the Galactic Republic. She trained a Thisspiasian Padawan, Oppo Rancisis, who eventually joined Yaddle on the High Council by the time of the Invasion of Naboo.
In 32 BBY, Qui-Gon Jinn brought the Chosen One Anakin Skywalker to the Jedi Temple on Coruscant where he met Yaddle and the Jedi elders. Following the Battle of Naboo, Yaddle pursued fellow Jedi Master Dooku after observing suspicious behavior on his part. She ended up encountering the Dark Lord of the Sith Darth Sidious, who ordered the Jedi Master to kill his colleague. Yaddle could not defend against the fallen Dooku for long, as she was promptly defeated and executed.
In 14 BBY, Yaddle was remembered and mentioned by name by the Latero pilot Greez Dritus, who speculated on her fate during the Great Jedi Purge with his Jedi associates. In 12 BBY, the Sith Lord Lord Darth Vader encountered apparitions of several Jedi, including Yaddle, while experiencing a series of Force visions.