The title of Jedi Lord was an informal title assumed by members of the Jedi Order during the hundred year period between 1,100 and 1,000 BBY. During this time, Jedi Knights seeking to assist worlds left undefended by the Galactic Republic became so revered that the citizens of the worlds they defended gave them castles and manors from which to conduct their business. Over the decades, these Jedi took the title Lord and effectively ruled their constituent systems for a solid century before renouncing their titles in the years following the Ruusan Reformation.