The castle of Kelefa is located about halfway between the current village of Kelefa and the Bay of Oitylo. It was built in 1679 by the Ottomans, in order to contain the Inner Mani region. Some years later, in 1685, the Maniots besieged the castle. They sent messengers to Venice so the Doge could send a fleet to help them capture the castle. The Venetians were currently at war with the Ottomans so they agreed and sent a fleet under Francesco Morosini. As soon the fleets bearing the symbol of St Mark the Ottoman garrison surrendered. A year later the Ottomans returned with a strong force and laid siege to the castle but were driven back. Along with the rest of the Peloponnese, the castle remained in Venetian hands for about 30 years, but in 1715 the Ottomans recaptured the Peloponnese. Around 1780 the Ottomans abandoned the castle, which became derelict.
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.