Chud
Chud or Chude (Old East Slavic: чудь, Finnish: tšuudi, Northern Sami: čuhti) is a term historically applied in the early East Slavic annals to several Baltic Finnic peoples in the area of what is now Estonia, Karelia and Northwestern Russia. It has also been used to refer to other Finno-Ugric peoples.
Arguably, the earliest attested written use of the word "Chuds" to describe Baltic Finnic peoples (presumably early Estonians) was c. 1100, in the earliest East Slavic chronicles. According to the Primary Chronicle, the invading troops of Yaroslav I the Wise defeated "Chuds" in a battle in 1030 and then established the fort of "Yuryev" (in what is now Tartu, Estonia).
According to Old East Slavic chronicles, the Chuds were among the founders of the Rus' state.