The Palestine Exploration Fund is a British society based in London. It was founded in 1865, shortly after the completion of the Ordnance Survey of Jerusalem by Royal Engineers of the War Department. The Fund is the oldest known organization in the world created specifically for the study of the Levant region, also known as Palestine. Often simply known as the PEF, its initial objective was to carry out surveys of the topography and ethnography of Ottoman Palestine – producing the PEF Survey of Palestine. Its remit was considered to fall between an expeditionary survey and military intelligence gathering. There was also strong religious interest from Christians; William Thomson, Archbishop of York, was the first President of the PEF.

Warren's Shaft is a vertical shaft next to the Gihon Spring, the main source of water of Bronze and Iron Age Jerusalem, discovered in 1867 by British engineer, archaeologist and military officer Charles Warren. The term is currently used in either a narrower, or a wider sense:In the narrower, initial sense, Warren's Shaft is the almost vertical natural shaft leading down to a pool fed by the Gihon Spring. In the wider sense, as the Warren's Shaft system, it is the Bronze Age water system allowing protected access from the city to the Gihon Spring.