At the height of his fame and success, while "The Importance of Being Earnest" (1895) was still being performed in London, Wilde prosecuted the Marquess of Queensberry for criminal libel. The Marquess was the father of Wilde's lover, Lord Alfred Douglas. The libel trial unearthed evidence that caused Wilde to drop his charges and led to his own arrest and trial for gross indecency with men. After two more trials he was convicted and sentenced to two years' hard labour, the maximum penalty, and was jailed from 1895 to 1897. During his last year in prison, he wrote "De Profundis" (published posthumously in 1905), a long letter which discusses his spiritual journey through his trials, forming a dark counterpoint to his earlier philosophy of pleasure. On his release, he left immediately for France, and never returned to Ireland or Britain. There he wrote his last work, "The Ballad of Reading Gaol" (1898), a long poem commemorating the harsh rhythms of prison life.