You will encounter several Byzantine churches in Athens. Most were constructed between the 11th and 12th centuries. The medieval churches share several characteristics: small brick buildings with a cross design, red-tile roofs and eight-sided domes. The Church of St. Catherine (Agia Ekaterini) in the Plaka neighborhood is an excellent example. It was originally dedicated to Saint Theodore when built in the 11th century. In 1767, the church was gifted to the Saint Catherine of Mount Sinai monastery. It now honors Catherine of Alexandria. She was martyred in Alexandria, Egypt in 305 AD at the age of 18.