The Oxford Companion to Chaucer -

With over 2,000 entries, this work provides assessments on almost all aspects of Chaucer. Entries, both short and long, from 'Aaron' to 'Zodiac', provide information on Chaucer's life and times, his works and the characteristics in them, his language and metre, his reading and the creative uses he made of it, and on his moral and literary themes.