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- Justinian chose physicist Isidore of Miletus and mathematician Anthemius of Tralles as architects; Anthemius, however, died within the first year of the endeavor. The construction is described in the Byzantine historian Procopius' On Buildings (Peri ktismatōn, Latin: De aedificiis). Columns and other marbles were brought from all over the empire, throughout the Mediterranean. The idea of these columns being spoils from cities such as Rome and Ephesus is a later invention. Even though they were made specifically for Hagia Sophia, the columns show variations in size. More than ten thousand people were employed. This new church was contemporaneously recognized as a major work of architecture. The theories of Heron of Alexandria may have been utilized to address the challenges presented by building such an expansive dome over so large a space.[citation needed] The emperor, together with the Patriarch Menas, inaugurated the new basilica on 27 December 537 – 5 years and 10 months after construction start – with much pomp. The mosaics inside the church were, however, only completed under the reign of Emperor Justin II (565–578).