The most well known poem contained within its pages is Y Gododdin, an early Welsh-language poem commemorating the warriors from Gododdin (Lothian in modern Scotland) who fell at the Battle of Catraeth (probably Catterick in North Yorkshire) around the year 600.
A passing reference to Twrch Trwyth also occurs in the elegy Gwarchan Cynfelyn preserved in the Book of Aneirin.
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