Estuna Church dates from the early 13th century or possibly the late 12th century. The structure of the building indicates that a tower was initially planned for the eastern end of the church but never built. It may have been intended as a defensive tower which became redundant as times became more peaceful as the Middle Ages progressed in Sweden.
The church has been rebuilt and expanded several times. During a renovation of the altar in 1733 a patch of parchment was discovered that noted the date of a re-inauguration of the church to 1298. This was probably done in connection with an enlargement of the church towards the west. The church porch was added during the 15th century. During a renovation in the 20th century, medieval frescoes were discovered and uncovered. Among the church furnishings, most date from the 18th century. The baptismal font is however older, from the 13th century. The elaborate crucifix was donated to the church in 1783 and made in Rome.
References:The Clementinum is a historic complex of buildings in Prague. Until recently the complex hosted the National, University and Technical libraries, the City Library also being located nearby on Mariánské Náměstí. The Technical library and the Municipal library have moved to the Prague National Technical Library at Technická 6 since 2009. It is currently in use as the National Library of the Czech Republic.
Its history dates from the existence of a chapel dedicated to Saint Clement in the 11th century. A Dominican monastery was founded in the medieval period, which was transformed in 1556 to a Jesuit college. In 1622 the Jesuits transferred the library of Charles University to the Klementinum, and the college was merged with the University in 1654. The Jesuits remained until 1773, when the Klementinum was established as an observatory, library, and university by the Empress Maria Theresa of Austria.