Although they were a nomadic people, and therefore putting boundaries on their territory is a very fluid prospect, by the 11th and 12th centuries this confederation was the dominant force in the areas that are now Kazakhstan, southern Russia, Ukraine, southern Moldavia, and eastern Wallachia (in Romania).
This widespread area meant they were in contact with many others. They fought against the Kingdom of Hungary. They fought against the Byzantine Empire. They fought against each other: they were employed as mercenaries by Byzantium to fight against their ethnic cousins, the Pechenegs, with offers of gold from Emperor Alexios I. They had a specific use for gold: armor. Their higher-ranking members wore gold face plates in battle.
They were described as a handsome people, with blond hair and blue eyes. The Russian aristocracy sought Cuman women due to their beauty. Men and women both wore pants, tunics, and caftans, although women's tunics were shorter. Deep crimson was a popular color for clothing. Men shaved the tops of their heads and wore the remaining hair in braids. They wore conical hats made of felt with a broad brim or leather with fur trim. Women also wore conical hats, but with a veil that hung down the back.
A 13th century archbishop records a marriage between a Cuman princess and a Hungarian prince. Ten Cumans swore an oath that they would defend the Kingdom of Hungary. When swearing, they did so with a sword in hand, the sword touching the body of a dog that had been cut in half. A crusade historian also reports something similar: at an alliance between the Cumans and Byzantines, the Cumans had a dog walk between the two groups, then they cut the dog and had the Byzantines do the same. They swore that if the two groups failed in their oath that they would be cut in pieces.
The Cumans were overwhelmed by the Mongols in the 1230s, with the option to be destroyed or to become part of the Golden Horde. They chose the Golden Horde, and eventually blended in with other ethnic groups.
The story of the marriage above comes from one of those Christians who took an interest in the Cumans and their neighbors. Tomorrow I'll tell you about John of Plano Carpini. See you then.