Pictured here is the Sultan leaving Topkapi Palace for Friday prayers in one of the capital's mosques circa 1810 by an unknown artist. The once-a-week outing was the only time the Sultan appeared in public. The advisers to the Sultan, the viziers, wore green. Chamberlains wore scarlet. Religious dignitaries wore purple and mullahs light blue. The master of horse dressed head-to-foot in dark green. Court officers wore light red shoes. Those who worked in the Grand Vizier??? office, located just outside the palace walls, wore yellow shoes. And among non-Muslims, Greeks wore black shoes, Armenians violet, and Jews blue slippers.