"Vienna School"-trained historian of Venetian art; author of a major "principles of art history" monograph and developer of Baroque Museum, Vienna. Tietze was the son of a Czech lawyer, Siegfried Tietze (d. 1920), and Auguste Pohl. The family name had originally been Taussig. He attended the Gymnasium Altstadt in Prague. His father converted the family from Judaism to protestant Christianity in 1893 moving the family to Vienna. Tietze graduated from the Schottengymnasium there in 1898. Anxious to be seen as fully Austrian, he volunteered for a year's service in the Austrian army 1899-1900.