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"Do not go gentle into that good night" is a poem in the form of a villanelle by Welsh poet Dylan Thomas (1914–1953), and is one of his best-known works. Though first published in the journal Botteghe Oscure in 1951, the poem was written in 1947 while Thomas visited Florence with his family. The poem was subsequently included, alongside other works by Thomas, in In Country Sleep, and Other Poems and Collected Poems, 1934–1952. The poem entered the public domain on 1 January 2024. It has been suggested that the poem was written for Thomas's dying father, although he did not die until just before Christmas in 1952. It has no title other than its first line, "Do not go gentle into that good night", a line that appears as a refrain throughout the poem along with its other refrain, "Rage, rage against the dying of the light".