The Holy Spirit (Helgeand) Church, sometimes incorrectly mentioned as St. James, was built in the early 1200s. It was probably constructed as a chapel for the Danish Guild and donated by the Danish King Valdemar. In the mid-1200s the guild lost its importance and the church was sacrified as Holy Spirit Church and it also functioned as a sanctuary. The church is octagonal and built on two floors. Both floors have a common choir.
The original central tower collapsed around 1365 and Johannes van Wese donated 100 mark to the reconstruction. The church was was destroyed by fire in 1611. The church ruins are open to visitors in summer season.
References:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.