Nowhere in Slovenia there are so many (remains of) castles and manors as there are in the river basin of Savinja. The reasons for that can be found in several facts. Firstly it is important to stress that up to 1140 this was the centre of Savinja margraviate, that a lot of property was gained by the Carinthia Krško bishops and last but not least that a lot of noble families settled in this area. Among them, the most important were certainly the mighty counts and princes of Celje.