A distinction must be made between the remains of the first arch of the bridge, known as Wilson's Arch, and those of the rest of the bridge and possible later additions to it. Absolute date Excavations between 2015 and 2019 collected organic material in the mortar used during various stages of construction. Radiocarbon dating indicated that the initial bridge to the Temple Mount was completed between 20 BCE and 20 CE, and a doubling in width occurred between 30 CE and 60 CE. The 2020 study concluded that Wilson's Arch was initiated by Herod the Great, and enlarged during the Roman Procurators, such as Pontius Pilate, in a range of 70 years. Structural correlations and relative date Stinespring argued already in the 1960s that the Arch is still preserved in his original Herodian form, based on the way it is bonded to the retaining wall of the Temple Mount, which indicates that it is "a definitive part of the ancient Temple structure." The fact that Roman theater-like structure which was discovered right underneath the arch was never finished, due to the outbreak of the Bar Kokhba Revolt or the death of the Emperor Hadrian in 138 CE, gives the terminus ante quem the Arch was built. The oldest of the pools beneath the arch was dated to 1305–1340 CE. Alternative theory: Umayyad date There are scholars who have favored dating the Arch's construction to the Umayyad period (651–750), basing their conclusions on what they see as evidence from the period of excavation after the Six-Day War, when Israel's Ministry of Religious Affairs began to excavate the area of the Western Wall still unexposed, and dig a tunnel beneath the existing structures above. During much of the time of these excavations, which went on between 1968–82 and was restarted in 1985, the Israel Antiquities Authority's (IAA) District Archeologist for Jerusalem was Dan Bahat, who became the archaeologist of the site after resigning from IAA. In his book, Jerusalem Down Under: Tunneling Along Herod's Temple Mount Wall, he writes that the evidence found was enough to convince him that despite earlier beliefs that the Arch was built during Herod's time, the later dating is correct. It is believed by those who date the current arch to the later period, that it was a replacement for an earlier arch erected during the Second Temple period, and that the Umayyads didn't just restore the