A city named for this concept contains the massive Saint Alexander Nevsky Cathedral and a “triangle of religious tolerance” home to the Saint Nedelya Cathedral. A school of thought proposing this concept as a fourth hypostasis in the Trinity included Vladimir Solovyov and Sergei Bulgakov. This concept names the most-visited cathedral in Kyiv and another church whose half-deteriorated Deësis (“dee-EE-sis”) Mosaic, featuring Christ Pantocrator (“pan-TOCK-ruh-ter”), marked the beginning of the Palaeologan (“pay-lee-AW-luh-gun”) Renaissance. Some Gnostics compare this figure to a female twin or wife of Jesus. A cathedral dedicated to this concept served as the episcopal see of the Ecumenical Patriarchate for a millennium after it was commissioned by Justinian I. For 10 points, what concept names the historic religious center of the Eastern Orthodox Church, a cathedral-turned-mosque in Istanbul? ■END■
ANSWER: Sophia [or Holy Wisdom or Hagia Sophia or Sancta Sapientia or Chokmah; accept Church of God’s Holy Wisdom or Ayasofya or Ayía Sofía or Naos tēs Hagias tou Theou Sophias; accept Saint Sophia Cathedral or Svyata Sofiya or Sobor Svyatoyi Sofiyi or Svyataya Sofiya or Sobor Svyatoy Sofii; accept Sofia or Saint Sophia Church or tsârkva Sveta Sofiya; accept Sophiology or Sofiologiya; prompt on Logos; prompt on Jesus Christ by asking “what aspect of him?”]
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= Average correct buzz position