Osman's tomb was formerly a Byzantine baptistery, and his son's tomb is in the nave of the neighbouring church fragments of its ancient mosaic pavement can be seen on the floor of the tomb.
Osman's son's tomb was moved to the neighbouring church from a different location.
mnli hypothesis: Osman's son's tomb was moved to the neighbouring church from a different location. premise: Osman's tomb was formerly a Byzantine baptistery, and his son's tomb is in the nave of the neighbouring church fragments of its ancient mosaic pavement can be seen on the floor of the tomb.