The Empire of Leasath-Aurelia, an empire formed by sister nations, to bring unity between Leasath and Aurelia. We may have fought Aurelia in war and defeated them, but we view them as equals, that is why I gave them equality in this empire.
—Diego Navarro, founder of the Empire
The Empire of Leasath-Aurelia (Also known as the Leasathian-Aurelian Empire, Leasath-Aurelia, Leasathian-Aurelia, and, mostly in Aurelian textbooks, Imperial Aurelia) was a short-lived bi-national empire formed by Diego Navarro, the Head of State of the nation of the Democratic Republic of Leasath, in the wake of Leasath's victory in the Leasath-Aurelia War. The Empire replaced Leasath within the Parliament of the Confederate States of Earth.
Diego Navarro viewed the Federal Republic of Aurelia with respect, and thus allowed Aurelia to keep home rule, but he had Leasath and Aurelia unite into a single empire, one which covered a significant portion of the Aerlandian Sea.
In 18 BBY the Empire was defeated by the Galactic Empire, Leasath and Aurelia were split apart and treated as separate territories by the Earth Empire.
Following the Liberation of Earth in 4 ABY the Empire wasn't restored, Leasath and Aurelia went back to being separate nations, Leasath returned to the Confederate States of Earth, whilst Aurelia went back to being part of the Union of Earth States, though both had very friendly relations.