Republic of Morac-Songhrati-Meads
The Republic of Morac-Songhrati-Meads and the later Kingdom of Humanity were states, retrospectively classified as micronations, that claimed the Spratly Islands. Claims about this entity date its creation to 1877, but the first verifiable evidence comes only from 1946.
Source: Wikipedia — Republic of Morac-Songhrati-Meads (CC BY-SA 4.0)