Commentary Inf XXVIII 70-75

The early commentators are not sure exactly who Pier of Medicina (a town between Bologna and Imola) was, but Dante and he apparently knew one another. While the nature of his schismatic behavior thus lies in shadow, the fact that his ensuing remarks refer to political intrigue would seem to mark him also as a political, rather than a religious, schismatic.

On verses 74-75 see Baldelli (Bald.1995.1).