Commentary Purg VI 13-14

The Aretine is Benincasa da Laterina.  See Toynbee (Benincasa d'Arezzo).  Jacopo della Lana (Lana.Purg.VI.13-14 ) says that Ghino cut off Benincasa's head in full view of the assembled papal court of Boniface VIII (ca. 1297) and somehow managed to make good his escape.  Ghino di Tacco was of a Sienese noble family; exiled from his city, he became a famous highwayman.  According to Boccaccio (Decameron X.ii), his nobility of character eventually resulted in his reconciliation with Pope Boniface before both of them died (in 1303).  In Dante's reference to him here there is no such positive treatment; Benincasa, not Ghino, is presented as being saved.