St. Patrick’s Purgatory, The Vision of Knight Owein (Tractatus de Purgatorio Sanctipatricii), The Vision of William Staunton, The Vision of Louis of France (Visio Ludovici de Francia), The Vision of Raymond de Perehlos, The Vision of Laurence Rathold, The Vision of George, Knight of Hungary, Or George Grissophan, The Vision of Laurent de Pasztho

Patrick was a fifth-century saint, who lived in Ireland. Among the legends surrounding his life is the story of his vision of purgatory. This legend gave rise to the identification of the spot where the entrance to purgatory might be found, located on Station Island in the lake, Lough Derg, a popular pilgrimage site in northeast Limerick. Around this site many legends arose. The first and foremost is the story of the Knight Owein, told by H. of Sawtry (Saltry) in the Tractatus de Purgatorio sancti Patricii (c. 1179–81) in Latin. A French text was soon derived from the numerous Latin manuscripts, which are numerous. Of the French translations there are at least seven in verse - one by Marie de France - and at least as many prose versions. There are also translations into Provencal, English (including “Owayne Miles”), and Italian. Criticism focuses on the history of Lough Derg, the site of the Purgatory. Accounts of, or references to, this work occur in the works of Matthew Paris, Roger of Wendover, Jacobus de Voragine, Caesarius of Heisterbach, Jacopo of Vitriaco, Vincent of Beauvais, Etienne de Bourbon, and Peter the Venerable.