Lahzar

Lahzar was a Jedi king who lived during the New Sith Wars between the Jedi Order's Army of Light and the Sith Brotherhood of Darkness. The king was a treacherous tyrant and, around 1000 BBY, he betrayed the Jedi and revealed his true nature by attacking the forces of Jedi Master Valenthyne Farfalla, but his navy was defeated by Farfalla in the Tholatin system. Lahzar's actions delayed the arrival of the Jedi Master's reinforcements to the planet Ruusan, which allowed the Sith to begin attacking a Jedi supply caravan. When Farfalla eventually arrived, the Jedi Lord Hoth chastised Farfalla for his delayed appearance, to which the Jedi Master responded indignantly that his men had fought Lahzar to reach Ruusan.

Text and facts from the “Lahzar” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.