1.  frederick i(n = noun.person) - son of Frederick William who in 1701 became the first king of Prussia (1657-1713);
is a kind of king, male monarch, rex
is a member of hohenzollern

2.  frederick i(n = noun.person) barbarossa, frederick barbarossa - Holy Roman Emperor from 1152 to 1190; conceded supremacy to the pope; drowned leading the Third Crusade (1123-1190);
is a kind of holy roman emperor

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