Porth-y-Tŵr (Welsh for Tower Gate) is a gatehouse and bell tower overlooking St Davids Cathedral. It is the sole survivor of four medieval gates to the walled Cathedral Close. The 13th-century octagonal tower, adjoining the gateway, now contains the cathedral's bells.
What is nowadays the bell tower was used by the bishops of St Davids for their consistory court and a record office for the episcopal see. The south tower and the range of rooms above the gate were used as a council chamber. Well appointed apartments, suitable for the mayor, were accessed via a doorway on the town side of the tower.
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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.