Vyachko of Koknese, also Vetseke of Kokenhusen (Latin: Rex Vesceka de Kukenois, Latvian: Vetseke, Russian: Вячко) was the ruler of the Principality of Koknese in present-day Latvia, a vassal of Polotsk, who unsuccessfully tried to establish himself as a local ruler first in Latvia and then in Estonia, and fought against the expansionism of the Livonian Knights at the turn of the 13th century.
Read more about Vyachko Of Koknese: Identity of Vyachko/Vetseke, Early Relations With The Crusaders, Vetseke and The Defense of Tartu