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The Romans established posts at Emona (Ljubljana), Poetovio (Ptuj), and Celeia (Celje); and constructed trade and military roads that ran across Slovene territory from Italy to Pannonia.
By the 15th century, the Slovene ethnic territory was reduced to its present size.
A part of the inner state was protected with a defensive line of towers and walls called Claustra Alpium Iuliarum.
A crucial battle between Theodosius I and Eugenius took place in the Vipava Valley in 394.
They were mostly Christianized by Irish missionaries, among them Modestus, known as the "Apostle of Carantanians".
This process, together with the Christianization of the Bavarians, was later described in the memorandum known as the Conversio Bagoariorum et Carantanorum, which is thought to have overemphasized the role of the Church of Salzburg in the Christianization process over similar efforts of the Patriarchate of Aquileia.
By the late Middle Ages, the historic provinces of Carniola, Styria, Carinthia, Gorizia, Trieste, and Istria developed from the border regions and were incorporated into the medieval German state.