The couple were married for eight years when in 1346, Enguerrand VI was killed in battle as part of the Hundred Years' War between France and England.
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When Catherine was six years of age, her father died; Catherine and four-year-old Agnes were placed under the guardianship of their paternal uncles, Frederick the Fair and Albert II, Duke of Austria.
Catherine of Austria, Infanta of Castile and Aragon, Queen consort of Portugal
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Frederick of Baden was the son of margrave Charles I of Baden-Baden and Catherine of Austria, sister of Frederick III, Holy Roman Emperor.