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In page Empress Elisabeth of Austria:

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Princess Ludovika and Duchess Helene were invited to journey to the resort of Bad Ischl, Upper Austria to receive his formal proposal of marriage. Ludovika also had the then-15-year-old Sisi accompany them, as Sisi had been mourning the recent death of the young Count she had loved, and had fallen into a lengthy depression.[citation needed] Ludovika hoped the change of scenery would cheer her up. Additionally, Archduke Karl Ludwig, Franz Joseph's second younger brother, would also be joining the Imperial family. Karl Ludwig and Sisi had formed a close friendship in childhood, exchanging letters and gifts. Her mother hoped them seeing each other again would end with a possible engagement for Sisi.[3]