Situated in Lesser Town is St. Nicholas Church, whose robust dome and thin bell-tower are an inseparable part of the Prague Castle skyline; it is one of the most sought after Prague churches. It belongs among the leading baroque constructions in Europe and is usually defined as being the most beautiful building of Czech baroque. It was built at a time when Prague was in the process of undergoing prominent changes, when during the second half of the 17th century the existing Renaissance style was replaced by Baroque; a style representing political and social changes having arisen after the Battle of Bila Hora (White Mountain) in 1620 - recatholisation and consolidation of absolutist ruler power.