Date: c. 762-766
Khatib al-Baghdadi (fl. eleventh century) writes that when the Abbasid caliph al-Mansur (r. 754-75) built the round city of Baghdad (Madinat al-Salam) he brought in a range of artisans to the site. This included engineers, architects, surveyors. See also: Engineer; Surveyor; Construction Worker; Mason.
Citation: Khatib al-Baghdadi, Taʾrikh Baghdād (Cairo, 1931), pp. 66-67. Translated in Lassner, Jacob. The Topography of Baghdad in the early Middle Ages (Detroit: Wayne State University Press, 1970), pp. 45-46.
Also: Milwright, Marcus. Islamic Arts and Crafts: An Anthology (Edinburgh: Edinburgh University Press, 2017), p. 32.