This gave rise to a literary and iconographic tradition lasting to John Milton and Shelley. From the earliest manuscripts, some believed to be Boccaccio autographs, diagrammatic family trees are included, which are thought to be the earliest non-Biblical uses of this type of graphic, which was already used in the form of the Jesse tree in art. The last two books of the work include a defence of poetry that is his latest and most extended discussion of the subject. The first printed edition was in Venice at the early date of 1472, of a version with some additions to the "Genealogia", and other short works by Boccaccio, shortly followed by an edition of 1473 which was the first book printed in Leuven. Four further Italian incunabulum editions were published (including in 1497), and a French translation in 1498 or 1499. All survive in healthy numbers, confirming the popularity of the work, which was reprinted in many more 16th century editions, some illustrated.