Question: What is the date of death of Ulrich Iii, Duke Of Carinthia's wife?
Sentence (from "Ulrich III, Duke of Carinthia"): Despite his attempts to secure the vast Babenberg inheritance through two marriages, first to Agnes of Merania, widow of the last Babenberg duke Frederick II of Austria, and then to Frederick's niece Agnes of Baden, Ulrich remained childless.
Relevant evidence: Yes