Dromedarii were camel-riding auxiliary forces recruited in the desert provinces of the late Roman Empire in Roman Syria.
They were developed to replace horses where these were uncommon. They were also helpful against enemy horses as they fear camels' scents.
Camels were seen as exotic and useful creatures, known for their ability to move over desert terrain. It is noted that dromedaries were used less often than bactrians, though the title "Dromedarii" may imply that dromedaries were used more often.
However, the Romans could not distinguish between bactrians and dromedaries, thus using both as a means of transportation. This is very similar to the camel cavalry used often by the Ottoman Empire. It is noted that camel cavalry was more commonplace due to the desert terrain during the early Muslim conquests.
A 1000-strong dromedarius unit, the ala I Ulpia Dromedariorum milliaria, was established by Trajan in Syria. A small number of dromedarii is recorded as part of the Cohors XX Palmyrenorum based in Dura-Europos in Roman Syria.
In the eastern regions, Roman military units often included a handful of camel riders, typically integrated into a cohors equitata. Records show between 32 to 36 dromedarii enlisted in cohors XX Palmyrenorum equitata at Dura-Europos during the early 3rd century.
The role of dromedarii varied, sometimes serving as infantry and other times as cavalry, depending on the local organizational structures. For instance, the 1,000-strong unit mentioned earlier was designated as an ala, while camel riders within cohors XX Palmyrenorum in Syria were attached to infantry divisions. Their names typically appeared at the end of enlistment rosters, following the infantry listings.
However, in Egypt, a dromedarius named Cronius Barbasatis was assigned to the cavalry turma under the command of decurion Salvianus. Cronius volunteered for this role and hadn’t transferred from another unit, indicating immediate recognition of his skills upon enlistment. Nonetheless, it’s generally believed that dromedarii would initially enlist as infantrymen, serving a few years in that capacity before transitioning to camel riders.
In addition to, each governor maintained a prestigious mounted “guard of honor”, known as the equites singulares, outfitted according to the historian and military leader Flavius Josephus in a manner akin to the troopers of an ala. Interestingly, these guards were selected from the ranks of the equites within the alae and cohortes equitatae stationed in the province, indicating their elite status.
Naturally, both the equites singulares and the individuals who would replace them in their parent units required mounts. So, in the Eastern provinces, dromedarii were additionally assigned to the equites singulares, further diversifying the composition of these specialized units.
Arguably, this was the most obvious adaptation to the desert made by the Roman army. The dromedarii (κάμηλιτοι in Greek) were clearly recognized as an official military specialization, embedded within cohortes equitatae and alae. While their strategic and tactical roles remain somewhat obscure, our understanding of their logistical significance is more robust. Camels were employed both in active campaigns and as part of the logistical infrastructure in established provinces.
Strabo mentions their utilization by the Roman prefect Gaius Aelius Gallus during operations against the Nabateans (who later used them as guides at the expedition to Arabia Felix), and historical evidence suggests the construction of the Berenike-Koptos route by Ptolemy Philadelphos’s forces for long-distance camel transport, although the intended use, military or civilian, remains ambiguous.
The limited extent of excavation and survey in desert regions constrains speculative interpretations, although it’s highly probable that camelry played a significant role at key junctures along various Egyptian communication routes besides serving as postal carriers and guardians for the Arabian governor.