High Quality Content by WIKIPEDIA articles! Alastor, or The Spirit of Solitude is a poem by Percy Bysshe Shelley, written from September 10 to December 14 in 1815 in Bishopsgate, London and first published in 1816. The poem was without a title when Shelley passed it along to his contemporary and friend, Thomas Love Peacock. The poem is 720 lines long. It is considered to be one of the first of Shelley`s major poems.