Question: Who is the paternal grandmother of Cangrande Ii Della Scala?
Sentence (from "Cangrande II della Scala"): Cangrande had a castle and a fortified bridge built in the town (see Castelvecchio and Castelvecchio Bridge) in order to grant him a safe place and a safe escape route towards Germany in the event of revolt against him in the city.
Relevant evidence: No