The Master of the Order was a rank and title bestowed upon a Jedi Master. The title signified that the Jedi Master was the leader of the Jedi Council. It was slightly different from the Grand Master title, although, the two would often merge under the same individual Jedi.
The rank was established upon the inception of the Jedi Order—then known as the Ashta Matha—to help organize the meetings of the Jedi Council. The Master often raised topics of concern and administered polls to avoid disorganized chatter. The Master of the Order was appointed via a vote by the Jedi Council—conducted by the Grand Master—it required the unanimous consent of the Council for approval. The position initially was a near-equal to that of the Grand Master; however, to avoid dissension and promote a unified vision, the rank was downgraded to—the Jedi Council deemed— a ceremonial position.
Although the title was held by many Jedi, only a few had been noted by historians. The three most significant were: Satele Shan, Otah and Mason Quarrell. Satele Shan, the descendant of Jedi Revan and Bastila Shan, took the title circa 3,653 BBY and navigated the Jedi and Galactic Republic through the Great War. Otah ascended to the position many years after training the future Grand Master Yoder Gree; once the latter joined him on the Council. Mason Quarrell, the Sicemonite Jedi, was given the title just prior to the Great Galactic War. He served the position from 30 BBY to, at least, 7 BBY.
The Master of the Order was known for its strict requirements. The candidate had to be a member of the Jedi Council and a Jedi Master. The position also mandated that all appointees had be elected unanimously. Once appointed to the seat, the Jedi served a life term on the Council, the only exceptions to this rule were death or total resignation from the Order.
The position started out nearly as powerful as the Jedi Grand Master. It had the power to call and lead meetings and to call for the removal of the Grand Master or call for a vote of incapacity of the Grand Master. That meant the Master could call for a poll of the Jedi Council to transfer power to the Master of the Order if the Council deemed that the Grand Master was unable to perform its or lead. Over time, the power was reduced to the point that it was considered a ceremonial position. The Master could no longer call for votes to remove or transfer powers from the Grand Master. In fact, the only powers that were retained were the ability to call for meetings and to organize the agenda dictated by the Council or Grand Master.
However, if the Council deemed that the Grand Master was unable to do their duties, the power would be temporarily granted to the Master of the Order. In spite of this, they could not change policy or the direction of the Order until they were named the permanent Grand Master and then they would assume the title and power of that position. The Grand Master could also appoint the Master as their permanent replacement or name them as the temporary Grand Master.
Masters of the Order
Behind the scenes
The Master of the Order was directly influenced by the canon Star Wars universe. The position was mentioned in expanded universe text sources. It also serves as a reason behind Mason Quarrell, a character of the Epic of the Star Wars, conducting the Council meetings rather than the higher ranked Yoder Gree.