The Salona reference article from the English Wikipedia on 24-Apr-2004
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Salona

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Also known as Salonae. Roman town on the site of the modern town of Solin, a suburb of Split in Croatia.

Salona served as the capital of the Roman province of Dalmatia. Birthplace of Emperor Diocletian in 245, who retired in 305 to a fortified palace he built at nearby at Aspalaton until his death in 313.

Salona was sacked by the Avars in the sixth century, and abandoned thereafter. The refugees from Salona inhabited Diocletian's palace, by then abandoned, and turned the palace into the fortified town of Spalato (Split).