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In 1921 the discovery of an impressive hexagonal building with a semi-circular hall in Istanbul, next to the Topkapı Palace, was made by the archaeologists of the French Army. This complex was considered for a long time the baptistery of a nearby (never found) basilica. This article suggests its identification with a huge dining room, part of a residential complex built in 5th century and modified during 6th century. The particular plan of the hall called “sigma” and few traces in literary sources suggest a link with the Imperial family, maybe with a property of the Theodosian dinasty.