Sullivan next joined the company of Selina Dolaro at the Royalty Theatre, opening on 30 January 1875 in the role of Don Andres, the British Viceroy, in Offenbach's "La Périchole". Richard D'Oyly Carte was manager of the theatre for Dolaro, and when one of "La Périchole"'s companion pieces proved weak, Carte asked Gilbert to collaborate with Arthur Sullivan to write a one-act piece, "Trial by Jury", for the theatre. Gilbert and Sullivan wrote the role of the Learned Judge for Fred Sullivan, and "Trial by Jury" opened at the Royalty 25 March 1875. Fred also continued to play Don Andres. Sullivan was made up for the role of the Learned Judge to look like the Lord Chief Justice, Sir Alexander Cockburn. The first-night critics reserved especial praise for his performance: "The greatest 'hit' was made by Mr. F. Sullivan, whose blending of official dignity, condescension, and, at the right moment, extravagant humour, made the character of the Judge stand out with all requisite prominence, and added much to the interest of the piece." "The Times" concurred: "Mr. F. Sullivan's impersonation of the learned and impressionable Judge deserves a special word of praise for its quiet and natural humour." Sullivan's performance was the hit of the show. F. C. Burnand wrote of him: "Fred Sullivan, Arthur's brother, was one of the most naturally comic little men I ever came across. He, too, was a first-rate practical musician. ... As he was the most absurd person, so was he the very kindliest. The brothers were devoted to each other".