Israel Antiquities Authority, The Damascus Gate Section, accessed January 2016. Quote: "Some researchers believe the gate was first erected at the time of Agrippa I, in the mid first century CE. If so, then the ancient gate structure was incorporated in course of the Third Wall."
Archaeological Sites in Israel-Jerusalem: The Northern Gate of Aelia Capitolina, on the website of the Israel Ministry of Foreign Affairs, 29 July 1998, retrieved 2 March 2018