derbendci
The guards charged with maintaining and defending a derbend in exchange for tax relief.
The derbendci, some two thousand families of Rumelia, acted as guards of mountain passes, bridges, and other strategic locations in exchange for tax relief and represent a transition from real fighters to auxiliary forces.
Where it comes from
From Ottoman Turkish دربندجی (derbendci).
Adapted from the Wiktionary entry derbendci (CC BY-SA 4.0).