-1400 1146?-1223? 1179?-1241 allusions appreciation astrologyinliterature celtic celticinfluences chaucer dictionaries england englishpoetry folklore geoffrey icelandchaucer influencegiraldus influencesnorristurluson inliterature irelandchaucer irishliterature knowledge literaturechaucer mythology mythologyinliterature names norse occultismchaucer oldnorseliterature personal scandinavianinfluences