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Then however , following the example of the church of Hagia Sophia in Constantinople , churches began to surround their altars with a colonnade or templon which supported a decorated architrave beam along which a curtain could be drawn to veil the altar at specific points in the consecration of the Eucharist ; and this altar screen , with widely spaced columns , subsequently became standard in the major churches of Rome .
 Hagia Sophia, Constantinople, Eucharist, Rome
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Hagia Sophia, Constantinople, Eucharist, Rome