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[[Image:Dura Europos baptistry.jpg|right|thumb|250px|Reconstruction of the [[Dura-Europos|Dura Europos ]] baptistry]]The baptistry may be located within the main structure of a [[church]] or as a separate structure located adjacent the church. Commonly, the sacrament of baptism for those becoming Orthodox Christians is conducted in the [[nave]] of the church, generally in portable pools or [[font]]s. In some churches the font or baptismal pool maybe may be "built-in". Baptistries were found in many early churches in Asia Minor and Italy, as illustrated in the third century in the Church at Dura-Europus[http://www.deeperstudy.com/link/dura_baptistery.html]. A sixth century example can be found in the Great Church of Holy Wisdom ([[Hagia Sophia (Constantinople)|Hagia Sophia]]) in present day Istanbul.