San Giovanni dei Lebbrosi is an ancient church in Palermo. While built by the Norman rulers, the architecture has strong Arabic influences. The builders may have been Fatimid architects. The church in 1119 was attached to a leprosarium, hence the title. The church was dedicated to St John the Baptist. The adjacent hospital no longer exists.
The church was initially commissioned in 1071 by Robert Guiscard and Roger I of Sicily. Tradition holds the besieging Norman Army had camped near this site, near an Arabic castle, and here erected a temporary shrine, which later became the site of the church. The leprosarium was putatively built because Roger II's brother died of Leprosy. Over the years, the hospital and church was under the control of various religious orders, including the Teutonic knights.
The church, which had become a house, underwent dramatic restoration from 1920 to 1934. Centuries of accretions were removed. Some of the internal columns have capitals decorated with Kufic script.
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.