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The Last Curator of Records was the final Curator of Records of the Jedi Order. A Jedi Master, he continued to serve his post until the final hours of the Galactic Republic, escaping "invading Imperials" on Coruscant and fleeing with his records to Toola. There, during the Great Jedi Purge, he was killed by Darth Vader and stormtroopers, his body vanishing into the Force.
Behind the scenes
Because Master T'un held this position as of 44 BBY, it is quite possible that they are one and the same.