He shows that Chaucer's work can be clearly divided into three chief periods, the chronology of which he presents in the following form[[12]].
First Period.
1366 (at latest). The Romaunt of the Rose.
1369. The Book of the Duchesse.
1372. (end of the period).
Second Period.
1373. The Lyf of Seint Cecile.
1373. The Assembly of Foules.
1373. Palamon and Arcite.
1373. Translation of Boethius.