Ictinus.

Very little is known about the life of Ictinus (ihk-TI-nuhs), an architect who worked in Athens during the time of Pericles (c. 495-429 b.c.e.). Ancient sources attribute three buildings to him. The first is the Parthenon on the Athenian Acropolis (447-432 b.c.e.). Ictinus designed the Parthenon together with the architect Callicrates, under the general direction of the sculptor Phidias. The second is the great Telesterion, or Hall of Mysteries, at Eleusis (c. 430 b.c.e.). Ictinus was one of a series of architects associated with this frequently modified building. The third is the temple of Apollo at Bassae in Arcadia, where Ictinus is the only recorded architect. Ictinus also wrote a treatise (now lost), with a certain Carpion, about the design of the Parthenon—a work that probably addressed the revolutionary mathematical concepts underlying its design.