Fall of Coruscant

The Fall of Coruscant was an event in 0 ACV, signalling the end of the Clone Wars and the rise of the Confederacy.

The Event
Anakin Skywalker and Obi-Wan Kenobi were killed by Count Dooku and General Grievous on board Grievous' capital ship, the Malevolence. Without Skywalker and Kenobi taking the Malevolence out of the battle, the Separatist forces managed to defeat the Republic fleet and begin bombarding the planet below.

In an act of incredible violence which was broadcast across the entire galaxy, the planet was completely destroyed. All who remained there were killed - including most of the Jedi Order, and almost the entire Senate.

Aftermath
Palpatine retreated to his private palace on Byss, while the C.I.S declared their victory. While the Clone War would not end until the Battle of Kamino in 2 ACV, this was considered to be the end of the Republic as a whole. The necessity of the bombardment would be debated for years after the fact, with arguments based on if it was truly required to kill so many people to end the war and establish a single government unending and ultimately proving a springboard for Bail Organa's New Republic movement, and attempts to remove Dooku from power.