Constantia, residential area, Western Cape province, South Africa, near Cape Town. It is located in Constantia Valley, famous since the 18th century for wines produced on both government and private farms. The Groot Constantia homestead there was built about 1685 by Governor Simon van der Stel and named for his wife, Constance; a fine example of Cape Dutch architecture, it has been restored and serves as a museum of antique Cape stinkwood furniture.