Most people think of the veil solely in terms of Islam, but it is much older. It originated from ancient Indo-European cultures, such as the Hittites, Greeks, Romans and Persians. It was also practiced by the Assyrians. Veiling had class as well as gender implications; thus, the ancient Assyrian law required it of upper class women while punishing commoners for it. The strong association of veiling with class rank, as well as an urban/peasant split, persisted historically up until the last century. Then more privileged women began rejecting the veil, as did Egyptian feminist Huda Sharawi, while poor women increasingly adopted it as a ticket to upward mobility. (A similar dynamic occurred with footbinding in modern China.)
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