Marchion's Declaration, alternatively referred to as Marchion Ro's speech, represents a communication delivered not long after the Starlight Beacon's destruction occurred in 230 BBY. Marchion Ro, known as the Eye of the Nihil, disseminated this broadcast from his flagship, the Gaze Electric, during which he made his identity known to the Galactic Republic and declared himself to be the primary authority over the galaxy.
After the transmission from Marchion Ro, Supreme Chancellor Lina Soh convened with a collection of notable figures from the Republic and the Jedi Order. This group included Senator Izzet Noor, Jedi Grand Master Pra-Tre Veter, Jedi Master Yarael Poof, and Admiral Pevel Kronara of the Republic Defense Coalition. They deliberated on the authenticity of Ro's communication, and in the end, they concluded that he was indeed the true Eye of the Nihil, as he professed.
The initial appearance of Marchion Ro's broadcast was in the 2022 novel titled The High Republic: The Fallen Star, penned by Claudia Gray and released as a component of the expansive Star Wars: The High Republic project spanning multiple media formats.