After long and intensive treatment at the spa Sophie gave birth to her son, Franz Joseph, in 1830. A quarter of a century later, Franz Joseph met his future wife in Bad Ischl, which had in the meantime become a town with international flair. It was 1853 and the Archduches Sophie had organised a ball to celebrate her son’s birthday. The ball took place in the Seeauerhaus and the Duchess Ludovica of Bavaria and her two daughters Helene and Elisabeth were invited. Those interested in Austrian history know very well that Franz Joseph and Elisabeth announced their engagement just a day after the ball and later married. Form this point on Bad Ischl became the summer residence of the imperial family.