Answer:
Finland briefly had a King in 1918, and the royal family he was taken from was the German royal family, specifically the House of Hohenzollern.
During that time, Finland was seeking independence from Russia and decided to establish a monarchy. The Finnish Parliament offered the throne to Friedrich Karl of Hesse, a German prince from the House of Hesse-Kassel, who accepted and became known as King Väinö I.
However, his reign was short-lived. Due to political and internal struggles, Finland decided to become a republic in December 1918, and King Väinö I abdicated the throne shortly thereafter.
Therefore, the King of Finland in 1918, briefly known as King Väinö I, was taken from the German royal family, the House of Hohenzollern.
