Commentary Purg VII 97-102

The following five figures were all kings rather than emperors, beginning with Ottokar of Bohemia (1253-78), who was in fact killed by Rudolph in 1278.  Just as Rudolph, for all his faults, is presented as saved, while his son Albert seems clearly not to be, so is Ottokar exalted while his son, Wenceslaus, is apparently headed for the second circle of hell (or lower).

      Singleton points out that in the Elysian fields

former enemies are also reunited in peace (Aen. VI.824-827).