Ad usum Delphini
The Delphin Classics or Ad usum Delphini was a series of annotated editions of the Latin classics, intended to be comprehensive, which was originally created in the 17th century.

The first volumes were created in the 1670s for Louis, "le Grand Dauphin", heir of Louis XIV (“Delphini” is the Latinization (genitive) of " Dauphin"), and were written entirely in Latin. Thirty-nine scholars contributed to the series, which was edited by Pierre Huet with assistance from several co-editors, including Jacques-Bénigne Bossuet and Anne Dacier. The main features included the main Latin texts; a paraphrase in the margins or below in simpler Latin prose (an "ordo verborum"); extended notes on specific words and lines, mainly about history, myth, geography, or natural sciences; and indices. One useful pedagogical feature of this series is that it keeps students reading and working in the target language (Latin).

The original volumes each had an engraving of Arion and a dolphin, accompanied by the inscription "in usum serenissimi Delphini" (for the use of the most serene Dauphin). The collection includes 64 volumes published from 1670 to 1698.

The "Ad Usum Delphini" series were reprinted for centuries and served in classrooms across Europe and the Americas. Beginning in 1819 a series of Latin classics was published in England under the name Valpy's Delphin Classics by Abraham John Valpy. That series was edited by George Dyer, who produced 143 volumes.

The expression "Ad usum Delphini" was sometimes used on other texts which had been expurgated because they contained passages considered inappropriate for the youth, and has been used pejoratively to indicate any work expurgated for the sake of younger audiences, and not just this series of Latin texts and commentaries.
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