Emona (early Medieval Greek: Ἤμονα) or Aemona (short for Colonia Iulia Aemona) was a Roman castrum, located in the area where the navigable Ljubljanica river came closest to Castle Hill, serving the trade between the city's settlers – colonists from the northern part of Roman Italy – and the rest of the empire.
Emona was the region's easternmost city, although it was assumed formerly that it was part of the Pannonia or Illyricum, but archaeological findings from 2008 proved otherwise.
From the late 4th to the late 6th century, Emona was the seat of a bishopric that had intensive contacts with the ecclesiastical circle of Milan, reflected in the architecture of the early Christian complex along Erjavec Street in present-day Ljubljana.
The Visigoths camped by Emona in the winter of 408/9, the Huns attacked it during their campaign of 452, the Langobards passed through on their way to Italy in 568, and then came incursions by the Avars and Slavs. The ancient cemetery in Dravlje indicates that the original inhabitants and invaders were able to live peacefully side by side for several decades. After the first half of the 6th century, there was no life left in Emona. The 18th-century Ljubljana Renaissance elite shared the interest in Antiquity with the rest of Europe, attributing the founding of Ljubljana to the mythical Jason and the Argonauts. Other ancient Roman towns located in present-day Slovenia include Nauportus (now Vrhnika), Celeia (now Celje), Neviodunum (now the village of Drnovo) and Poetovio (now Ptuj).
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