Ernst Ziller, German-Greek architect, designed the Presidential Mansion (d. 1923)
Ernst Moritz Theodor Ziller (Greek: Ερνέστος Τσίλλερ, Ernestos Tsiller (22 June 1837 – 4 November 1923) was a German born university teacher and architect who later became a Greek national. In the late 19th and early 20th centuries, he was a major designer of royal and municipal buildings in Athens, Patras, and other Greek cities.