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Her parents wanted their daughters to all make important political marriages, which would create alliances for Duke Berthold IV. Gertrude married the Árpád prince Andrew II, younger son of late King Béla III of Hungary, before 1203. Andrew thereby took sides in the conflict over the German throne, joining his father-in-law in his support of Duke Philip of Swabia, while his elder brother King Emeric of Hungary backed King Otto IV of Germany.