Another striking change in the second version is the omission of certain too explicit lines in which the poet had dared to set forth the duties of kings towards their subjects. Part of this wise advice still remains, but evidently Chaucer found it dangerous to call Richard's attention to the necessity for hearing his people's petitions and complaints, and the later version contents itself with a more general statement that kings should ... nat be lyk tiraunts of Lumbardye That han no reward but at tirannye. It is also noteworthy that several words which appear in their older form in the first version are modernised in the second (_e. g._ in the first line _sythes_ becomes _tymes_), so that it is possible to see the language in actual process of development. Chaucer's last and greatest work, the _Canterbury Tales_, was begun in 1386--though as has been shown, certain isolated tales, or rough sketches for tales, were already in existence--and the composition continued till 1389, when it--like so many of his other poems--was left unfinished. A number of fugitive pieces and lyrics also date from about this time, as does the prose _Treatise on the Astrolabe_ written for his little son, Lewis. The popularity of Chaucer's poetry is shown not only by repeated references to him as master and teacher, made by his immediate successors, but by the entire Chaucer apocrypha which soon sprang into being. Some genuine works of his--such as the _Book of the Lion_ (this very probably was no more than a translation of Machault's _Le Dit du Lion_), have been lost, but to make up for this a number of poems have been attributed to him, some of which were not written until years after his death. Subjoined is a list of the more important of these, with the names of the real authors in cases where scholars have succeeded in tracing them. _The Testament of Love._ Thomas Usk (_d._ 1386). _La Belle Dame sans Merci._ Sir R. Ros (fifteenth century). _The Cuckoo and the Nightingale_ (sometimes called _The Book of Cupid God of Love_). Sir Thomas Clanvowe. _The Flower and the Leaf_; _The Assembly of Ladies_. Considered by some scholars to be the work of the same hand. Both purport to be written by a woman. _The Court of Love._ _The Second Merchant's Tale_, or _The Tale of Beryn_ (containing a preliminary account of the Pardoner's adventures in Canterbury). _The Complaint of the Black Knight._ Lydgate. _The Tale of Gamelyn._ This poem is included among the MSS. of the _Canterbury Tales_. Professor Ten Brink suggests that Chaucer may have intended to work it up into the Yeoman's tale. _The Letter of Cupid._ Occleve. CHAPTER III CHAUCER'S TREATMENT OF HIS SOURCES