What is the origin of this writing? What did it say? Did it have any religious significance (perhaps an earlier version of note-placing)? And when was this writing removed?
The first article quotes the twelfth-century traveler Benjamin of Tudela, who writes that in the central house of prayer in Jerusalem at that time, Shaar Rachamim - as well as at Kever Rachel - "Jews who would arrive there would write their names upon the wall".
In this picture, some of the names are legible.