The buildings designed and built by the architect Sinan (d. 1588) in the imperial capital Istanbul, with their stripped-down aesthetic of impressive volumes and monumental domes, have become the epitome of Ottoman architecture. Active from the 1530s until the 1580s, Sinan designed monuments at both the large scale required by the sultans and the smaller one accorded to viziers, admirals, and princesses, as seen in the mosques built for Sultan Süleyman the Magnificent in 1550–77 and for one of his grand viziers, Rüstem Pasha, in 1563. Sinan’s work and the work of the office of imperial architects (hassa mimarları) define our understanding of architecture in the Ottoman Empire from the sixteenth century onward, and they were integral parts of the functioning of a centralized empire that tightly regulated its administration and its aesthetic outlook.