The first written note about Bítov comes from the foundation paper for cannonry at Stará Boleslav, dating back to 1046. The core of the document leads to the assumption that Bítov castle was founded by Prince Břetislav I. The continuous fortification line of castles protecting the Czech-Austrian border was established here, on the river Dyje, at the beginning of the 12th century. It is interesting that a similar fortification line was built also on the Austrian side to protect their land from Czech attacks (Raabs, Pernegg, Walkenstein, and other castles).
Source: website Bitov castle: http://www.hradbitov.cz
