The Ecclesiastical History of Theodoret 82Of the sorcery at Carræ which was detected after his death. After he was slain the jugglery of his sorcery was detected. For Carræ is a city which still retains the relics of his false religion.

Julian had left Edessa on his left because it was adorned with the grace of true religion, and while in his vain folly he was journeying through Carrae, he came to the temple honoured by the impious and after going through certain rites with his companions in defilement, he locked and sealed the doors, and stationed sentinels with orders to see that none came in till his return. When news came of his death, and the reign of iniquity was succeeded by one of piety, the shrine was opened, and within was found a proof of the late emperor's manliness, wisdom, and piety. For there was seen a woman hung up on high by the hairs of her head, and with her hands outstretched. The villain had cut open her belly, and so I suppose learnt from her liver his victory over the Persians.

This was the abomination discovered at Carrae.