While in the service of the chief architect of the Ottoman Empire, Mehmed Agha (d. ca. 1622), in 1614, the scholar Caʿfer Efendi (d. after 1633) wrote Risāle-i miʿmāriyye (A Book on Architecture).1 He also wrote another book, or risāle, on geometry (hendese) from notes made during his conversations with Mehmed Agha. We know about this latter, now-lost manuscript only because of Caʿfer's mention of it in his introduction to Risāle-i miʿmāriyye:

Since we are associated with his [Mehmed Agha's] circle and have been near him for many years until the present time, whenever an issue related to the science of...

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