Commentary Par XXXIII 10-12

For the elevation of Mary found here (and in all this passage), see Carroll (DDP Carroll.Par.XXXIII.1-39): '[Dante] must have been familiar with the distinction of Aquinas between latria, the worship due to God; dulia, the veneration given to saints and Angels; and hyperdulia, the higher veneration given to Mary, as the most exalted of creatures (Summa, II-II, q. 103, a. 3, 4).'  See two earlier commentators who also cite this threefold distinction, if without tracing it to Aquinas: Guido da Pisa (DDP Guido.Inf.XXI.48) and John of Serravalle (DDP Serravalle.Par.XXI.106-111).