The Birth of Venus to Botticelli's Florentine contemporary, and Lorenzo di Medici's court poet, Angelo Poliziano. The iconography of "The Birth of Venus" is similar to a description of a relief of the event in Poliziano's poem the "Stanze per la giostra", commemorating a Medici joust in 1475, which may also have influenced Botticelli, although there are many differences. For example Poliziano talks of multiple Horae and zephyrs. Older writers, following Horne, posited that "his patron Lorenzo di Pierfrancesco asked him to paint a subject illustrating the lines", and that remains a possibility, though one difficult to maintain so confidently today. Another poem by
Sandro Botticelli Filippino Lippi, son of his master. In June of that year he was commissioned by the judges of commercial cases to paint two panels from a set of the Seven Virtues for their court; for some reason, only one, "Fortitude" (now in the Uffizi Gallery) was finished. Botticelli both matched his style and composition to the other panels by Piero del Pollaiuolo, and tried to outshine him "with fanciful enrichments so as to show up Piero's poverty of ornamental invention." There is often uncertainty in distinguishing between the contributions of Botticelli, the Lippis, and other pupils and imitators of Botticelli.