Trinity Church, Copenhagen

Trinitatis Church is located in central Copenhagen, Denmark. It is part of the 17th century Trinitatis Complex, which includes the Rundetårn astronomical observatory tower and the Copenhagen University Library, in addition to the church. Built in the time of Christian IV, the church initially served the students of Copenhagen University. It is situated at the corner of Landemærket and Købmagergade. The interior was seriously damaged in the fire of 1728 but was rebuilt in 1731.

Initial plans in 1635 were for a student church at Regensen, the dormitory for students at Copenhagen University, but the following year, new plans emerged with the corner of Landemærket and Købmagergade earmarked for the church location, as it was decided to include the church in a complex extending to a church library and an astronomical observatory. The humanistically inspired combination was from a commission of Christian IV. There were three builders, namely Hans van Steenwinckel the Younger, Leonhard Blasius, and Albertus Mathiesen. At the time of construction, the church was the second largest in the city, second only to the Church of Our Lady. As the church was only intended to be used by university students and professors, it may appear oversized, but all indications are that the library space above the nave needed a certain church size.

The foundation stone was laid July 7, 1637, and the Round Tower was completed in 1642. The church was consecrated on Trinity Sunday 1656. The Copenhagen University Library was installed in the church loft in 1657. After marrying the widow of J.M. Radeck in 1685, Christian Geist assumed Radeck's organist position at the church.

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