The Lieven family (Latvian: Līveni; Russian: Ливен) is one of the oldest aristocratic families of Baltic Germans. Caupo's grandson, Nicholas, was the first to spell his name Lieven.
They claim descent from Caupo of Turaida (Latvian, Kaupo), the Livonian quasi rex who converted to Christianity in 1186, when Bishop Meinhard attempted to Christianize the region. Henrici Chronicon Lyvoniae tells that, in winter 1203–1204, Caupo went to Rome with Theodoric, a Cistercian Monk (who was to become the founder of the Livonian Brothers of the Sword, then the first bishop of Estonia). They were received by the Pope Innocent III who backed up their plans to Christianize Livonia.
According to feudal records, the Lieven ancestor Gerardus Līvo (1269) and his son Johannes (1296) entered service as vassals to the Archbishop of Rīga. One of Caupo's da…Read more on Wikipedia