The first evidence that exists of the original structure and seed of Basílica Menor de la Sacra Iglesia Parroquial de San Ildefonso dates back to 1248, when it was created as a chapel for serving the Cathedral. Two centuries later, in 1430, it became the scene of a famous miraculous event: the descent of the Virgin Mary to the city of Jaén. After this event, the building became a shrine dedicated to the Virgin of the Chapel and homage was paid to the image of her found inside it. In the sixteenth century, the Virgin of the Chapel was named patron saint of Jaén.
The church comprises three doorways: the oldest, in Gothic style, is at the back of the church. The side doorway, in Renaissance style, has a relief of San Idelfonso receiving the mass vestments from Mary. The last to be built was the main doorway, in Neoclassical style, which is crowned by an image of the Saint who the building is named after. The remains of the famous architect and stonemason, Andrés de Vandelvira, are buried here.
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.