It is believed that Saint Domangard or Donard founded a monastery in Maghera in the early christian period, c. 500 AD. He lived as a hermit on Slieve Donard, a nearby mountain that is named after him. There are no antiquities remaining from the early foundation but excavations in 1965 produced evidence of occupation around the tower during the Early Christian period. The medieval church situated behind the more modern church probably dates to the 12th century. It is much harder to date the round tower as there are no features such as windows or doors that normally help in dating round towers.
The tower, which is built from rough uncoursed granite field-stones similar to the tower at Castledermot, is believed to have fallen in the 18th century as a result of storm damage. All we see today is a 5.4 metre high stump with a large breech on the eastern side of the tower. This may represent the position of the doorway, suggesting a rather low entrance. The diameter of the tower at base level is 4.85 metres. The stones used in the building of the tower suggest a 10th century date but is not definite proof.
References:The ancient Argos Theater was built in 320 BC. and is located in Argos, Greece against Larissa Hill. Nearby from this site is Agora, Roman Odeon, and the Baths of Argos. The theater is one of the largest architectural developments in Greece and was renovated in ca 120 AD.
The Hellenistic theater at Argos is cut into the hillside of the Larisa, with 90 steps up a steep incline, forming a narrow rectilinear cavea. Among the largest theaters in Greece, it held about 20,000 spectators and is divided by two landings into three horizontal sections. Staircases further divide the cavea into four cunei, corresponding to the tribes of Argos A high wall was erected to prevent unauthorized access into the theatron and may have helped the acoustics, but it is said the sound quality is still very good today.
Around 120 CE, both theaters were renovated in the Roman style.