The Anthemius of Tralles reference article from the English Wikipedia on 24-Apr-2004
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Anthemius of Tralles

Anthemius of Tralles (born about 474, died about 534) was professor of geometry at Constantinople and architect with Isidore of Miletus of Hagia Sophia. Anthemius had previously written a book on conic sections, excellent preparation for designing the elaborate vaulting of Hagia Sophia.