Vuissasclavus (Latin), transliterated Višeslav (Croatian), was a duke (la|dux; hr|knez) who is believed to have ruled somewhere in or near Dalmatian Croatia in the first few decades of the 9th century.[1]
Višeslav's name is known from an inscription left on the Baptismal font of Prince Višeslav, surviving to this day. The font is considered a symbol of early Croatian history and the people's conversion to Christianity. The inscription is in Latin and mentions the name of a priest named John (Ivan) who baptized people during "the time of Duke Višeslav" in the honor of John the Baptist.[2]
Historians have been making numerous attempts to date the reign of Višeslav, and to locate his domain geographically, and older Croatian historiography has a lot of claims about this, but there is no present-day consensus about where or when he ruled beyond a Slavic group Christianized by the Carolingians in the early 9th century.[1]