The site of Ǧabal Mūsā, also known as Hagion Oros, hagia Koryphe, the Holy Summit, or Mountain of the Law, is situated in southern Sinai, in the immediate proximity of St. Catherine’s Monastery. Considered the location where Moses received the Ten Commandments (an association first attested to in the fourth or fifth century), it has understandably for many centuries been a key pilgrimage destination for Jews, Christians and Muslims alike (Panayotidi and Kapoissi-Verti 2009: 187; Kapoissi-Verti and Panayotidi 2010: 73, 75). A three-aisled timber roofed basilica was constructed on the summit in the second half of the sixth century, during the reign of Justinian, dated based on the fact that textual references made to the structure only occur after 560 CE, coupled with the architectural similarities shared by it and the Justinianic katholikon of St. Catherine’s Monastery (Panayotidi and Kapoissi-Verti 2009: 187). The chapel was destroyed at some point, likely by an earthquake, and a mosque was erected atop it in the 11^th/12^th century, incorporating architectural elements of the destroyed basilica (Panayotidi and Kapoissi-Verti 2009: 187-188). Throughout the years, numerous smaller chapels have been built, with the final phase having been the construction of the single-aisle chapel of the Holy Trinity, erected in the early 20^th century and still standing today. Like the preceding constructions, this chapel also incorporated architectural elements of the Justinianic church including the three-sided apse (Panayotidi and Kapoissi-Verti 2009: 188; Kapoissi-Verti and Panayotidi 2010: 84). The feature of interest for the project lies in a pre-Justinianic structure identified during excavations “carefully enclosed in the north aisle when the small basilica was built” (Panayotidi and Kapoissi-Verti 2009: 189, fig. 4). This structure is considered by the excavators to be the small oratory built in 362-363 by St. Julianos, as recorded by Theodoret of Cyrrhys in his philotheos historia (c. first half of the fifth century), and perhaps also referenced by the pilgrim Egeria who visited c. 383CE (Panayotidi and Kapoissi-Verti 2009: 189; Kapoissi-Verti and Panayotidi 2010: 76, 87- 88, fig. 26). Though there is indeed an amount of material datable to the fourth century, namely glass shards, which attest to presence at that time, the dating of this earlier structure to the fourth century is far from certain (Kapoissi-Verti and Panayotidi 2010: 93).