Date is not known for building. It could have been built at any time over a three hundred year period up to about 1000 ad. The curved window could suggest that it is a later in that period but the door suggests that it is earlier. The crack in the stone over the door is relatively new, since the 1960s and the stone immediately over the door looks to have been replaced. The large number of visitors has let to a lot of graffiti inside.