Seswenna, a planet situated in the Outer Rim Territories' Seswenna system, served as a Galactic Republic bastion throughout the High Republic Era. The Nihil marauders' expansion of their Stormwall, which enclosed their Occlusion Zone territory, resulted in Seswenna's unexpected inclusion within Nihil space.
Conan Antonio Motti, a human male admiral hailing from Seswenna, held a position on the Imperial Military's Joint Chiefs and oversaw naval activities on the first Death Star.