Reichsfürst
The Counts of Celje () or the Counts of Cilli (; ) were the most influential late medieval noble dynasty on the territory of present-day Slovenia. Risen as vassals of the Habsburg dukes of Styria in the early 14th century, they ruled the County of Cilli as immediate counts ("Reichsgrafen") from 1341 and rose to Princes of the Holy Roman Empire in 1436.