Si-Di-Ri was a male Tiss'shar and the President of the Tiss'sharl League on the planet Tiss'sharl during 0 ABY. Eight months into that year, the Sith Lord Darth Vader of the Galactic Empire paid a visit to Si-Di-Ri and the League, which acted as the government of Tiss'sharl, forcing them to lower the prices of the TaggeCo blaster cartridges they sold to the Empire. Following a failed assassination attempt against Si-Di-Ri, Vader used the President to lure out a representative from the Alliance to Restore the Republic, as Si-Di-Ri was dealing with the Alliance in light of the price cuts the Empire demanded. After figuring out that Vader had used him, Si-Di-Ri realized that everyone had a higher master, even a president. He then resigned as the head of the Tiss'sharl League.