Tyropoeon Valley (i.e., "Valley of the Cheesemakers") is the name given by Josephus the historian (Wars 5.140) to the valley or rugged ravine, in the Old City of Jerusalem, which in ancient times separated Mount Moriah from Mount Zion and emptied into the valley of Hinnom. The Tyropoeon, now filled up with a vast accumulation of debris, and almost a plain, was spanned by bridges, the most noted of which was Zion Bridge, which was probably the ordinary means of communication between the royal palace on Zion and the temple. http://en.wikipedia.org/wiki/Tyropoeon_Valley