The Kothringi were a race of tribal men that once inhabited Black Marsh. The demonym is seen as both Kothri and Kothringi. They are noted for being fierce; and having "metallic skin" and "reflective faces."
Before the Cyrodilic human slave uprising against the Ayleids in 1E 242, the Kothringi were among the many tribes of men that the Ayleids used as slaves. The Kothringi were eventually wiped out by the Knahaten Flu that started in 2E 560. By 13th of Sun's Dawn, 2E 561, the Flu had already started affecting even the most remote of Kothri settlements, such as Stillrise Village in Shadowfen. In that case, the Flu had apparently been brought into the settlement from Mud Tree Village, by two trader apprentices named Abaaleb and Sana. Still in 2E 561, Shaman Chirah of Stillrise (under Chieftain Suhlak's orders) prayed to Z'en for a cure for the deadly disease, but had no answer. That led him to appeal to Clavicus Vile, wishing for his village to not die from the disease. The Daedric Prince then turned all of the villagers into undead.
The Kothringi generally preferred to go naked, although a few wore clothes when outside their native land. Their garb, as seen in The Elder Scrolls Online, appears to be simple leather with animal bones stitched in. They lived in round stone huts with chimneys, topped with domed thatched roofs. The triskelion is seen etched into rocks around their villages. They appear to have had a shamanic society and worshiped a pantheon of their own, but had no known unique gods. Z'en (a god of Toil) was apparently the main god[, with Dibe-Mara-Kin (the "mothers of the Around-us") as blessing-givers. In Stillrise Village, Clavicus Vile was worshiped as a last resort against the deadly Flu.