The Lost Twenty
The Lost Twenty refers to the 20 Jedi Masters who have renounced their position within the Jedi Order and left due to philosophical differences with the Jedi Code. These differences can stem from differing interpretations of the Jedi Code to what the Council dictates, all the way to opposing views on the nature of the Force, Civil Service, or the role of the Jedi in the Republic. The identities of the Lost Twenty are known only to a few Jedi, the Council, the administrator of the Jedi Archives, and the Twenty themselves (presuming they are still alive).
Upon leaving the Order, these Masters relinquish their lightsabers and abandon the use of the Force. Though most have lived the rest of their lives in peace, a small number fall to the darkness, becoming antagonists for the Jedi of their age.