Note: A cycle of twelve narrative poems published between 1859 and 1885. Editions of this should, properly, be varianted depending on how many of the poems are included, but often we do not know that. Apparent chronology (from Wikipedia):

• The first set of Idylls, "Enid", "Vivien", "Elaine", and "Guinevere", was published in 1859.
• The Dedication was published in 1862, a year after the Prince Consort had died.
• "Enid" was later divided into "The Marriage of Geraint" and "Geraint and Enid", and "Guinevere" was expanded (date unknown).
• The Holy Grail and Other Poems appeared in 1869.
• "The Last Tournament" was published in Contemporary Review in 1871.
• "Gareth and Lynette" was published in 1872.
• The final idyll, "Balin and Balan", was published in Tiresias and Other Poems in 1885.
• The epilogue, "To the Queen," was published in 1873.

Synopsis: Wikipedia: Retells the legend of King Arthur, his knights, his love for Guinevere and her tragic betrayal of him, and the rise and fall of Arthur's kingdom. The whole work recounts Arthur's attempt and failure to lift up mankind and create a perfect kingdom, from his coming to power to his death at the hands of the traitor Mordred. Individual poems detail the deeds of various knights, including Lancelot, Geraint, Galahad, and Balin and Balan, and also Merlin and the Lady of the Lake. There is little transition between Idylls, but the central figure of Arthur links all the stories.