Which poet wrote "The Ballad of Reading Gaol" whilst imprisoned for being gay?

The story behind the answer

Oscar Wilde wrote The Ballad of Reading Gaol after being imprisoned in 1895–97 for “gross indecency” under Victorian laws criminalizing homosexuality. He served time in Reading Gaol; on release he published the poem in 1898 under the signature “C.3.3.” — his prison cell identifier.

The poem condemns the brutalities of prison life and the death penalty, inspired by the execution of fellow inmate Charles Thomas Wooldridge. To remember it: connect “Reading Gaol” with “Wilde in Reading,” and recall the famous line, “Yet each man kills the thing he loves.” The distractors point elsewhere: Wilfred Owen is a World War I poet; Lord Byron a Romantic adventurer; William Blake an earlier visionary. Only Wilde’s life and imprisonment directly match the poem.