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How did Frederick I help Pope Adrian IV before his imperial coronation?

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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.

Before his imperial coronation in 1155, Frederick I provided critical assistance to Pope Adrian IV by helping to suppress the political unrest in Rome led by Arnold of Brescia.12

Arnold had instigated a revolt against papal authority, creating a volatile environment in the city. Frederick captured Arnold and handed him over to the city prefect, who subsequently had him hanged, burned at the stake, and his ashes scattered in the Tiber River. This action helped stabilize the situation for the Pope, who needed imperial support to maintain his position against the Roman commune. Following this, Adrian IV honored the Treaty of Constance and proceeded to crown Frederick as Holy Roman emperor on June 18, 1155.123