The pool's original date of construction is unknown. and entraps the runoff waters of the upper watercourse of the
Hinnom valley. Others have speculated that it may have been the Serpent's Pool mentioned by
Josephus.
Roman period A Herodian construction date, proposed by older researchers, has been disputed by more recent studies, which date the construction of the pool to the Byzantine period. Itzik Schwiki of the Jerusalem Center Site Preservation Council attributes the construction of the Mamilla Pool itself to Herod.
Byzantine period The possibility that the pool was built during the Byzantine period has had its supporters among researchers for at least a century. Israeli archaeologist
Ronny Reich estimates a death toll of 60,000 people before the Persian authorities put an end to the killing. The eyewitness account of Strategius of St. Sabas narrates: "Jews ransomed the Christians from the hands of the Persian soldiers for good money, and slaughtered them with great joy at Mamilla Pool, and it ran with blood." In the 19th century, Horatio Balch Hackett described the pool: At the distance of several hundred yards we come to another pool,
Birket el-Mamilla, generally supposed to be the Upper Gihon of Scripture, (Isaiah 36, 2.) This reservoir is still used, and on the ninth of April contained three or more feet of water. It is about three hundred feet long, two hundred wide, and twenty feet deep. It has steps at two of the corners, which enable the people not only to descend and fetch up water, but to lead down animals to drink. It is customary, also, to bathe here.
20th century After the
1948 Arab–Israeli war, the Jerusalem municipality temporarily tried to connect the pool to the Jerusalem water supply, and coated the pool with cement. Eventually, the pool fell into disuse. ==Dimensions==