The Liberator, also known as the Guardian of the Republic during the era of the Galactic Republic, belonged to the Liberator-class Troopship category.
Although equipped for hyperspace travel, the Liberator's speed was considered sluggish when compared to contemporary vessels. The Galactic Republic retired the ship not long before its own demise. Following the conclusion of the Clone Wars, Garris Shrike acquired and commanded the vessel, renaming it Trader's Luck. Han Solo spent his early life aboard this ship, serving against his will as a member of Shrike's group of spacers.
The Rebel Alliance purchased the Trader's Luck for a minimal price in 2 BBY. They refurbished it for troop transport purposes and gave it the name Liberator. The Liberator played a role in the evacuation of liberated Ylesian slaves after the Battle of Ylesia in 0 BBY.