lor:black" lang="EN-US">Avars
and Slavs at the end of the 6th century, prompted the
Roman population to withdraw into easily defensible locations such as islands
or peninsulas. This started local urbanisation and by the 7th century, under Byzantine rule, Piran had become heavily fortified.
Despite the defences, the Franks conquered Istria in 788 and Slavs settled in the
region. By 952, Piran had become a part of the Holy Roman Empire
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