Adonaïs is a pastoral elegy written by Percy Bysshe Shelley for John Keats in 1821, and widely regarded as one of Shelley's best works. The poem, which is in 495 lines in 55 Spenserian stanzas, was composed in the spring of 1821 immediately after April 11, when Shelley heard of Keats' death some three months earlier. It is a pastoral elegy, in the English tradition of John Milton's Lycidas. Shelley had studied and translated classical elegies. The title of the poem is likely a merging of the Greek "Adonis" and the Hebrew "Adonai" (meaning "Lord"). Most critics suggest that Shelley used Virgil's tenth Eclogue, in praise of Gallus, as a model.
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