All of the Concordat-class frigates to be produced were launched before the end of the Reunification War. A number survived the War, despite the conquest of the various Periphery nations by the Star League Defense Force; seven of these vessels were still actively serving in either the Magistracy of Canopus or Taurian Concordat navies during the closing years of the Star League.
One of the seven Concordats still in service was the TCS Parin; one of six Concordat-class frigates within the Taurian navy as at April 2765, the Parin and two of her sister ships, the TCS Marantha Calderon and TCS Parilicium, were deployed in support of II Corps of the Taurian Defense Force. II Corps was deployed on the border of the Federated Suns, and the Parin and her sister ships had been assigned to assist the three active regiments of II Corps in deploying rapidly as needed. Each of the three ships was assigned in support of a particular regiment; the Parin was supporting the Hyades Light Infantry at the time.
As of 2813, the Parin was both the last known surviving Concordat-class vessel and last operational WarShip within the Taurian Navy. While the Taurian Defense Force was engaged in the so-called Taurian-Canopian War at the time, the Parin was not called into action and remained stationed at Flannagan's Nebulea throughout the entire conflict. While the exact fate of the Parin is unknown, none of the Concordat-class frigates are known to have survived the First Succession War.
- Historical: Reunification War, p.218-219, "Concordat (Frigate)"
- Field Report 2765: Periphery, p. 4, "WarShips of the Territorial States"
- Field Report 2765: Periphery, p. 24, "II Corps"
- First Succession War, p. 101 "The Succession War (2786-2821) - Hard Times: The Decline of the Periphery - The Taurian-Canopian War (2813-2814)"