The Eastern Orthodox Keras Kardiotissas is dedicated to Virgin Mary that is situated near the village of Kera of the Heraklion regional unit in Crete. It is built on the north slopes of Mt. Dikti, at an altitude of 650 m and a location that is approximately 50 km east of Heraklion, next to the road to Lasithi Plateau.
The exact date of the monastery's establishment is unknown. However, references to it are made in manuscripts dating from the early fourteenth century. The monastery was named after an old icon of Theotokos that according to tradition was miraculous. That icon was stolen in 1498 by a wine merchant and transferred to Rome where it is now permanently enshrined in the Church of St. Alphonsus near the Esquiline Hill. The stolen icon was replaced by another one in 1735 that is also regarded as miraculous. During the Ottoman occupation of Crete, the monastery often served as a local revolutionary center and suffered several retaliatory attacks as a result. In 1720, Kera monastery became Stauropegic (independent of the local Bishop).
The monastery is surrounded by fortified walls. The main church (katholikon) was originally built as an arch-covered single space structure and was later expanded with two narthexes and a smaller chapel. The church features murals dating to the 14th and 15th centuries.
Today, the monastery functions as a nunnery. It celebrates the birth of Mary on September 8th every year.
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.