Palpatine

Palpatine was the emperor of the Galactic Empire and later the Imperial Remnant.

Pre-Armada
Originally the Supreme Chancellor of the Republic during the Clone Wars, Palpatine reorganized the Republic into the Galactic Empire, naming himself its emperor. He remained the emperor throughout the Galactic Rebellion and the Fallen War until the reformation of the Empire into the Imperial Remnant.

A Galaxy Divided
After years of rebuilding the Imperial Remnant and civil unrest in the galaxy, Palpatine called for a galactic senate meeting, with representatives from the other galactic factions that were gaining power and influence. However, this was a ruse to mask his plans for an eventual conflict with the Dominion Empire to regain lost territory after the Fallen War.

While Palpatine had his subordinates coordinate diplomatic meetings with the other factions, he secretly had a military base constructed deep within Dominion territory in plans for a first strike. The base was discovered by the Dominion with the help of Kaelani, an Imperial officer within the Remnant that acted as a double agent for the Dominion Empire. Even though the base was successfully defended, the battle forced both Palpatine and the Dominion Empire Premier, Rie Basoar, to officially declare war.

Several weeks after the declaration, while Palpatine was preparing for the annual Remnant senate meeting, he was detained in his office by his Senior Adviser, Pavaliin. Suspecting that it was a coup, Palpatine attacked Pavaliin to make an example of anyone who would oppose his rule. Unaware that Pavaliin was force sensitive, he was caught by surprise and lost both his arm and leg in the ensuing fight. Defeated, Palpatine was brought up to the capital building's roof and executed on live holonet. His death, along with Pavaliin revealing himself as Fallen, was the catalyst of the Remnant Civil War.