Analysis of information sources in references of the Wikipedia article "Hagia Sophia" in English language version.
The original church on the site of the Hagia Sophia is said to have been ordered to be built by Constantine I in 325 on the foundations of a pagan temple.
Earlier second church ordered by Theodosius II, built by architect Rufinus, current Church was ordered by Emperor Justinian and designed by Greek scientists Isidore of Miletus and Anthemius of Tralles
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