The title of Grand Master had existed within the Jedi Order for much of its history, representing the elected head of the entire Order. The appointment of a Grand Master was reserved to the Jedi High Council, with a unanimous vote needed to install the Order’s leader. Bestowed only upon the Order’s greatest and wisest of all Masters, it was not unheard of for several Masters to hold the title, forming elite guilds before the Ruusan Reformation of the Galactic Republic.
Held by several Masters throughout the Order’s history, the earliest recorded Grand Master was Biel Ductavis, who was appointed in 10,966 BBY. The Kel Dor Zym, who was the Grand Master throughout the Great Galactic War, was assassinated shortly after the fall of the Jedi Temple in 3653 BBY. Sometime later, Satele Shan was elected as Grand Master, becoming the youngest known individual to ever receive the title. Several millennia later, Master Fae Coven held the title, leading reforms within the Order as it moved away from its militant position it held throughout the Old and New Sith Wars. During the Republic’s Golden Age, Coven authored the Jedi Temple guidebook, The Jedi Path: A Manual for Students of the Force, with the help of some of the leading Masters of the era. Master Coven served a long term, even meeting her eventual successor, Yoda. Master Yoda was the last Grand Master of the Old Jedi Order, holding the title as early as 82 BBY. Under Yoda, the Order was disbanded as the Dark Lords of the Sith returned to power in 19 BBY and ushered in a new era which saw the initiation of the Great Jedi Purge.
Before his death, the exiled Master Yoda helped Luke Skywalker complete his training as a Jedi; Skywalker would eventually rebuild the Order and declare himself Grand Master during the Swarm War of 36 ABY. Leading the Order he had built for many years, Skywalker was held responsible for the actions of the Jedi-turned-Sith Jacen Solo by the Galactic Alliance government. After trying the Grand Master, Chief of State Natasi Daala exiled Skywalker from the galactic capital of Coruscant and the Jedi Order in 43.5 ABY until he could prove what had caused Solo’s turn to the dark side of the Force. In the meantime, Skywalker and Daala agreed to the appointment of Master Kenth Hamner as acting Grand Master, until Skywalker returned or the High Council elected another Master.
When tensions between Daala’s Galactic Alliance and the Jedi Order grew, the Jedi refused to continue appeasing her demands of the Order. The Masters wanted to launch a wing of StealthX starfighters to help Skywalker fight a new Sith threat, but Hamner feared that the Galactic Alliance would think the launch was against them and would open fire on the StealthXs. However, when the Council discovered that Hamner had taken unilateral actions in making an agreement with Alliance Admiral Nek Bwua’tu to stall the launch until Bwua’tu gave him permission, they removed him from his position as acting Grand Master and decided to launch the wing, forming a plan with Booster Terrik to keep the starfighters safe. Hamner attempted to stop the StealthX launch, and in the ensuing skirmish with Master Saba Sebatyne, he fell to his death. The Masters then unanimously voted for Sebatyne, who had led the vote of no confidence against Hamner, as the new acting Grand Master. She felt that the appointment was wrong, as she was deeply upset over her failure to prevent Hamner’s death, but eventually accepted the position.
Following a Jedi coup that removed Daala from power and placed the Jedi in charge of the government, Skywalker’s sentence was revoked, allowing him to resume his position as Grand Master. He did not return to Coruscant immediately, however, instead staying on the planet Nam Chorios to defeat the dark side entity Abeloth, who was his primary concern for the moment. Skywalker eventually returned to Coruscant and convinced the Jedi to leave the planet in order to lure the Sith out.