Where is the former imperial palace which  Augustinian Church is located next to located
Augustinian Church, Vienna The Augustinian Church (German: "Augustinerkirche" ) in Vienna is a parish church located on Josefsplatz, next to the Hofburg, the winter palace of the Habsburg dynasty in Vienna. Originally built in the 14th century as the parish church of the imperial court of the Habsburgs, the harmonious Gothic interior was added in the 18th century. The official name of church and parish is St. Augustin, but it is locally called "Augustinerkirche".
Palace of the Porphyrogenitus The Palace of the Porphyrogenitus (Greek: ), known in Turkish as the Tekfur Sarayı ("Palace of the Sovereign"), is a late 13th-century Byzantine palace in the north-western part of the old city of Constantinople (present-day Istanbul, Turkey). An annex of the greater palace complex of Blachernae, it is the best preserved of the three Byzantine palaces to survive in the city (together with the ruins of the Boukoleon Palace; and the ruins of the Great Palace of Constantinople with its surviving substructures, retrieved mosaics and standing Magnaura section), and one of the few relatively intact examples of late Byzantine secular architecture in the world.