The Jupiter class Battlestars were laid down in the early days of the First Cylon War. There were originally twelve built, one representing each of the Twelve Colonies of Kobol. They were heavily engaged in the war, and only three of the original twelve survived to see the armistice signed, ending the war. After the war, the surviving Battlestars remained in service, supplemented by additional ships under construction during the war. The class was continually upgraded and modified over the years, and several were still in service until the Fall of the Twelve Colonies.