Abstract
In the essay, a fourteenth century fragment of the commentary by Iacomo della Lana is critically published. It concerns the introduction and vv. 1-88 of Inferno X. It is proposed that the linguistic patina belongs to the area between the Veneto Region and the Po Valley: no clue helps to localize it more precisely. A philological study highlighting the errors in the text places this fragment within the stemma suggested by Volpi in his critical edition (2009).