Darth Jalor (formerly Jal) was the son of Jedi Masters Yoda and Yaddle, born in 19 BBY. Jalor was secretly born, to Jedi Masters Yoda and Yaddle. Yoda had taken Jal to live with him on Dagobah after he was exiled. Yoda trained Jal and Luke Skywalker at the same time. He learned the light side of the Force. He also learned Yoda's combat skills with his lightsaber. After Yoda's death, Jalor went to Taris.
Jalor's chosen mission was to rebuild Taris for as long as possible. He rebuilt it and met many Jedi. After four years, the reconstructing was complete and he decided to become part of the New Jedi Order.