A hypogeum was discovered in modern Istanbul north of the Gate of Pege (Turkish Silivrikapı) in 1988 between the outer and inner Theodosian Walls at the base of Tower 37. It appears to have been the tomb of an aristocratic family. The structure, possibly dating to the early 5th century, measures 7.70 x 6.30 meters with a north-south orientation. It has a gable roof covered with limestone slabs and consists of a burial chamber and an antechamber. It has five sarcophagi (one made of marble and four made of limestone) with reliefs including depictions of Christ and the Twelve Apostles, Moses receiving the Law, and the Sacrifice of Isaac. The marble sarcophagus has a christogram flanked by candlesticks. The style of these reliefs suggests they date from the late 4th century to early 5th century. Some of the reliefs were damaged by treasure hunters, but they were moved to Istanbul Archaeological Museums when treasure hunters were caught. Copies of the originals were then placed in the hypogeum. There were fragmentary frescoes depicting unidentifiable figures in a rural landscape that have largely been lost. The structure is now closed to the public.