One topic we hope archaeologists could potentially answer is the possible conversion of the Garamantes to Christianity in the 6th century. We know of at least 4 or 5 6th century sources that refer to Christianity among the Garamantes or with their neighbors, although the most direct source is John of Biclar. John of Biclar, whose chronicle mentioned Garamantian envoys to the Byzantines requesting peace and to become questions, gives a date of 568 or so. However, earlier references in the 6th century hint at a Christian presence among the Garamantes or their neighbors. For instance, Cosmas Indicopleustes, the famous 6th century traveler who is an important source on Aksum during this period, alluded to the land of the Garamantes as one that included churches.
While Cosmas Indicopleustes may have writing rhetorically to suggest how universal Christianity was, it is interesting that he wrote around 550, several years before the Garamantes sent a delegation to the Byzantine Empire (to the coast or Constantinople?). In addition to these aforementioned writers, Procopius, whose Buildings includes a section on churches and construction in Libya and North Africa during the reign of Justinian. Like the others, Procopius was writing around the middle of the 6th century, and according to him, the Byzantine Empire promoted Christianity in Ghadames, Augila (including a church for the Mother of God), and among various Berber peoples like the Gadabitani. He rebuilt and refortified cities like Leptis Magna, where he also constructed a chapel in honor of Mary.
One more 6th century writer of the Roman Empire also alluded, indirectly, to the Garamantes. In his epic on the campaigns of John against the Berbers, Corripus wrote that neighbors of the Garamantes (Nasamonians) were part of the Berber alliance that attacked John. The genre and type of reference used by Corripus here is probably exaggerating the number and diversity of Berber foes John Troglita fought to portray him as a more heroic figure. Nonetheless, we know from earlier incidents that the Garamantes did occasionally participate or join in raids against the Romans on the coast of Libya in earlier centuries. If the Garamantes or their neighbors were involved in the conflict with John Troglita, perhaps it helps explain why they were seeking peace with the Byzantines by 568?
Additional references to the Garamantes in relation to Vandal North Africa (epigrams of Luxorius which reference Garamantes and their dark skin) and the Mediterranean can be found. And The Archaeology of the Fazzan series found evidence of ongoing trade and exchange with the Mediterranean at Garamante sites. However, no evidence of a church has been found at the capital of the Garamantes or any other site. In fact, archaeologists found evidence for the persistence of use of pagan temples. Indeed, Islam itself does not appear to have spread in the capital of the Garamantes for a few centuries after Uqba b. Nafi attacked Garama. Brunschevig also cited evidence that suggests the Fazzanis were pagans in the late 700s. So, what happened? Was Christianization of the Garamantes real or did the distance and realities of Byzantine rule in coastal Libya make it an ineffective mission? Or was the Fazzan already fragmented with a state or chiefdom based at Waddan and, perhaps, Zawila, the real centers of the Fazzan who were more likely to have received an actual church? Was Knut Vikor's theory correct about Qasr Umm Isa in Kawar being Jado (Djado)? If so, perhaps the place name is a testament to that era of 6th century Christian expansion, though we lack any evidence that the Kawar site ever hosted Christians. Besides this speculative theory, references in the early Arabic sources to Egyptians and Rum on an oasis route that connected Egypt to areas of the western Sudan may hint at contacts with Copts and Byzantines in the desert via Fazzan and Kawar.