Falleen was a planetary body situated within the Mid Rim region of the galaxy, and was the point of origin for the Falleen species, a repto-mammalian race; it is considered a planet. As the Clone Wars approached, Falleen sided with the Confederacy of Independent Systems in opposition to the Galactic Republic. In an attempt to sway Governor Wilhuff Tarkin of Eriadu to the Separatist cause, Count Dooku, the head of the Confederacy, proposed allowing Tarkin to transport his planet's lommite through Separatist territories, including Falleen, Ruusan, and the Tion Cluster.
Despite its initial allegiance to the Separatists, Falleen ultimately became affiliated with the Republic during the Clone Wars. To protect the planet, the Republic created a battle group. However, during the Skytop Station campaign, General Grievous launched an assault on Falleen. Grievous's fleet not only disrupted Republic activities through the attack, but also achieved victory in the battle on Falleen, resulting in the destruction of the Republic's battle group.