can you tell me more about its author?
Dante Alighieri, probably baptized Durante di Alighiero degli Alighieri and often referred to simply as Dante, was an Italian poet.
Dante Alighieri
Dante Alighieri (), probably baptized Durante di Alighiero degli Alighieri and often referred to simply as Dante (, ,; – 1321), was an Italian poet. 
where did the battle of dyrrhachium take place? The battle was fought outside the city of Dyrrhachium, the major Byzantine stronghold in the western Balkans, and ended in a Norman victory. between whom did it take place? The Byzantine Empire, led by the Emperor Alexios I Komnenos , and the Normans of southern Italy under Robert Guiscard, Duke of Apulia and Calabria. when did the latter come into power? 1058 is he portrayed in literature? Yes, in the "Divine Comedy", Dante sees Guiscard's spirit in the Heaven of Mars can you tell me more about this work? The Divine Comedy is a long Italian narrative poem, begun c. 1308 and completed in 1320, a year before his death in 1321. what is its structure? It is composed of 14,233 lines that are divided into three "cantiche" (singular "cantica") – "Inferno" (Hell), "Purgatorio" (Purgatory), and "Paradiso" (Paradise) – each consisting of 33 cantos (Italian plural "canti"). what does he mention about purgatory? In this Dante's illustrative examples of sin and virtue draw on classical sources as well as on the Bible and on contemporary events.
wiki:1584236
Dante Alighieri [SEP] Introduction
Dante Alighieri (), probably baptized Durante di Alighiero degli Alighieri and often referred to simply as Dante (, ,; – 1321), was an Italian poet. His "Divine Comedy", originally called (modern Italian: "Commedia") and later christened by Giovanni Boccaccio, is widely considered the most important poem of the Middle Ages and the greatest literary work in the Italian language. Dante is known for establishing the use of the vernacular in literature at a time when most poetry was written in Latin, making it accessible only to the most educated readers. His "De vulgari eloquentia" ("On Eloquence in the Vernacular") was one of the first scholarly defenses of the vernacular.