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Terra Mariana, comprising present-day Estonia and Latvia, was established as a principality of the Holy Roman Empire.
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Terra Mariana
Vassal state of the Holy See
Terra Mariana was the formal name for Medieval Livonia or Old Livonia. It was formed in the aftermath of the Livonian Crusade, and its territories were composed of present-day Estonia and Latvia. It was established on 2 February 1207, as a principality of the Holy Roman Empire,…Source: Wikipedia (CC BY-SA)
Principality
Monarchical state under the rule of a prince or princess
A principality is a type of monarchical state or feudal territory ruled by a prince or princess. It can be either a sovereign state or a constituent part of a larger political entity. The term "principality" is often used to describe small monarchies, particularly those in…Source: Wikipedia (CC BY-SA)
Holy Roman Empire
European political entity (800–1806)
The Holy Roman Empire, also known as the Holy Roman Empire of the German Nation after 1512, was a polity in Central and Western Europe, usually headed by the Holy Roman Emperor. It developed in the Early Middle Ages, and lasted for a millennium until its dissolution in 1806…Source: Wikipedia (CC BY-SA)