The pristine world was part of the Galactic Republic until a stone mite infestation 22 BBY prompted it to secede shortly before the onset of the Clone Wars. While Tynna seceded and joined the Confederacy of Independent Systems, they returned to the Republic prior to the end of the war with Senator Streamdrinker serving in the Galactic Senate until his arrest after the Declaration of a New Order in 19 BBY.
During the early Galactic Civil War, the Rebel Alliance considered basing themselves on Tynna, but chose Yavin 4 instead. The world was a New Republic stronghold during the Thrawn campaign. During the Yuuzhan Vong War, Tynna was conquered by the hostile race, who bio-engineered the planet's extensive seas for their own purposes.