Proper noun
A geographical region in north-eastern part of modern Croatia.
In medieval times: Banate of Slavonia, covering northern parts of modern Croatia and north-western parts of modern Bosnia.
In early modern times: Kingdom of Slavonia, covering north-eastern parts of modern Croatia and region of Syrmia in modern Serbia.
Source: en.wiktionary.orgComing from two directions, North (via today's East Austria and Czech Republic), settling in the area of today's Carinthia and west Styria and South (via today's Slavonia), settling in the area of today's central Slovenia. Source: Internet
The Habsburgs eventually secured them (by 1815) and Dalmatia and Istria became part of the empire, though they were in Cisleithania while Croatia and Slavonia were under Hungary. Source: Internet