A male Jedi Master who served the Jedi Order and the Galactic Republic as a General in the Grand Army of the Republic during the Clone Wars trained Jedi Winslau Da'k. The Master was imprisoned on Morcanth by his former student, as Da'k had been corrupted to the dark side of the Force by agents of the Galactic Empire following the dissolution of the Jedi Order. Later the Master was released and brought to good health and joined the newly reestablished Jedi Order during the time of the New Republic.
A Force-sensitive, the man was trained in the ways of the Force by the Jedi Order and eventually attained the rank of Jedi Master. Sometime around the Separatist Crisis he selected the young Initiate Winslau Da'k as his Padawan, teaching him all he knew. When the Clone Wars erupted between the Republic and the Confederacy of Independent Systems, the man took up the rank of General in the Grand Army of the Republic.
Surviving all three years of the war, the Master and Padawan Da'k managed to escape the execution of Contingency Order 66 by their troopers, an order which effectively disbanded the Jedi Order. Going to ground, Padawan Da'k encountered Dark Lord of the Sith Darth Vader, who corrupted him to the dark side unbeknownst to the man's master. Serving out his self-imposed exile on the remote planet Morcanth deep in the Unknown Regions, the Jedi Master was outsmarted by his corrupted student and imprisoned on the world. While Da'k became a warlord on the world, his former master grew malnourished and ill deep in his prison.
When the Galactic Empire and the Sith were destroyed, the New Republic rose up to replace it. As word of the corruption on Morcanth reached the ears of the fledgling democracy and the newly reconstituted Jedi Order both groups sent agents to infiltrate the dictatorship. After students of the Order defeated Winslau in combat, the apprentices discovered the frail and dying Jedi Master in the subterranean dungeons. Releasing him, the Jedi took the man to their new praxeum on Yavin 4 where he was nursed back to health. After making a full recovery, the Master took up the position of instructor at the academy.