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Which pope crowned Frederick I Holy Roman emperor in 1155?

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Medieval manuscript miniature showing Frederick I as a crowned crusader holding an orb and scepter, with Henry of Schaftlarn kneeling and presenting a book to him. — Frederick I Frederick I as a Crusader with (right) Henry of Schäftlarn dedicating to him a copy of the History of the First Crusade by Robert of St. Remy; miniature from a manuscript in the Vatican Library.

Pope Adrian IV crowned Frederick I (Barbarossa) as Holy Roman emperor on June 18, 1155, in Rome.12