Italian bishop, poet, and translator who is remembered chiefly for his popular and widely translated treatise on manners, Galateo.

After growing up in Mugello, Della Casa studied in Bologna, Florence, Padua, and Rome. In 1544 he was named archbishop of Benevento but was sent as papal nuncio to Venice, and in 1555 Pope Paul IV made him secretary of state. Besides some youthful satiric verse in the manner of Francesco Berni, Della Casa produced lyric poems in a majestic style and some political works, such as Orazioni politiche (1707; “Political Discourses”), in which he expressed his sorrow for the calamities of Italy.

The work that brought Della Casa immediate renown, however, was his sane and witty treatise Galateo. Written between 1550 and 1555, first published with his Rime in 1558, and first translated into English by Robert Peterson in 1576, Galateo differs from an earlier etiquette manual, Baldassare Castiglione's Il cortegiano (“The Courtier”), in being more concerned with the details of correct behaviour in polite society than with courtly etiquette. Like Il cortegiano, Della Casa's manual became widely read throughout Europe.