Sentence:  The first three paragraphs of the translation are a condensed paraphrase of the first <WSD>foretale</WSD>, which tells of the birth of Aengus and how he obtains Etain for Midir by clearing twelve plains and creating twelve rivers (only nine are named in the story) [...] 
Meaning of the word marked with <WSD> tags:  An account or telling given as an introduction to a larger body of work; prologue; a prior or previous recollection or account of events