(1) Barbarossa was crowned Emperor Frederick I by the Pope.

(2) It was made for the palace of Frederick I.

(3) It was designed for the palace of Frederick I.

(4) Holy Roman emperor (1212-1250) and king of Sicily (1198-1250) as Frederick I. He led the Sixth Crusade (1228-1229), capturing Jerusalem, and was in continual conflict with the papacy.

(5) The policy of restricting the importation of foreign produce leads Frederick I of Prussia to impose a tax on chocolate in 1704.