Romanesque rotunda, built on top of the mountain Říp to celebrate the victory of Prince Soběslav I over Emperor Lothar.

This fabled hill lifting itself from the plains of the Elbe features in the earliest Czech mythology – the legend about the arrival of great Forefather Čech, which was first recorded in the Cosmas chronicle.

On the summit stands St. George chapel (originally St. Adalbert), a Romanesque rotunda with apsis and western round tower built from cubed masonry.

All three segments of the building are vaulted. The rotunda was consecrated in 1126 in memory of the victory of Duke Soběslav I over the German king Lothar (later Holy Roman Emperor Konrad III) in the Battle of Chlumec near Ústí nad Labem.

Only an additional tower with an oratory and vaults were probably added to the original sanctuary in this period.

The development of the rotunda and apse itself can be tied to the period after 1039, when the body of St. Adalbert was brought to Prague from Gniezno in Poland.

Minor repairs took place in 1798 and in 1826 secondary extensions were removed.

Patriotic camps took place on Říp from the mid-19th century and in 1868 one of the foundation stones to build the National Theatre in Prague was taken from here.

The building was given a purist remodelling from 1869–1881: new windows were perforated in the nave and apse, the original entrance on the west side of the tower was walled in and replaced by a new one in the south wall of the nave, and the stone roof panels were replaced by concrete ones.

Only two little composite windows in the tower and one window on the south side of the nave retained their original appearance.

The external plaster was removed from 1920–1930 and a wooden oratory in the nave was demolished.

A statue of St. George with the dragon by Eduard Veselý from Prague, and a stone relief of St. George fighting the dragon by Bernhard Otto Seeling from 1874 are found in the rotunda; there are also recent statues by Stanislav Hanzík.

The rotunda is in care of the National Heritage Institute.