The two sections of mud-brick wall, which stretch for 132 meters (433 feet) in total, have been dated to the reign of Thutmose IV, the council said in an e-mailed statement. According to ancient Egyptian texts, the pharaoh built the enclosure after the Sphinx appeared to him in a dream complaining that it was being choked by sand.
http://www.bloomberg.com/news/2010-11-02/egyptian-archaeologists-discover-3-400-year-old-enclosure-wall-for-sphinx.html