Roman wall in phase with 21003 and 21005. The wall appears to have been built over 21046, an earlier dry stone wall. The backwall (22019, 22007, 22020, 21003) is preserved at different phases - 22019 has the tile leveling layer preserved, 22007 is probably equal to 21046, and 22020 and 21003 have the last two courses of the second phase wall preserved. The dump (21082) appears to abut the lowest course of thid wall.