Catherine of Saxe-Lauenburg (Katarina in Swedish) (24 September 1513 – 23 September 1535) was the first wife of Gustav I of Sweden and thus Queen of Sweden from 1531 until her death in 1535. Life Catherine was born in Ratzeburg to Magnus I, Duke of Saxe-Lauenburg and Catherine, daughter of Henry IV, Duke of Brunswick-Lüneburg. Her marriage to Gustav I of Sweden was arranged for political reasons. Gustav wished to marry shortly after having taken the Swedish throne. He had failed in his negotiations to marry Dorothea of Denmark (also proposed to by Philip of Hesse who was considered more advantageous); Sophia of Mecklenburg; Anna of Pomerania (parents considered his rule too unstable); and Hedwig of Poland (parents discontinued negotiations because of Swedish Reformation), and was finally advised to consider the Duchy of Saxe-Lauenburg. Though the duchy was small and poor, it had many advantages: its dynasty was related to many of the most powerful dynasties of Europe, which would give valuable connections with the German princes; it was Protestant, which was important for the ongoing Swedish Reformation, but could also give Imperial connections through Catherine's mother; it would give a valuable link to Denmark, as Catherine's older sister Dorothea was married to Christian, the Crown Prince of Denmark; and finally, the duchy at that point was known as a center for mercenaries, which was important for Gustav as a newly established ruler. The negotiations started in 1528, but were delayed several years as the bride's father doubted the stability of the Swedish throne, doubt partially confirmed by events such as the Dalecarlian rebellions. Finally, with mediation from Lübeck, they were completed after almost three years, and Catherine was granted the counties of Korsholm, Kalmar and Öland as a dower. In September 1531, Catherine was escorted to Sweden on a fleet by the "highest lords and ladies of the realm" headed by her future sister-in-law Margaret with her spouse Count John of Hoya, and met her future husband for the first time. Their wedding was celebrated in Stockholm on her 18th birthday 24 September 1531. Shortly after the royal wedding, in events hosted by King Gustav and Queen Catherine, Brita Leijonhufvud, the daughter of the king's second cousin Ebba Eriksdotter Vasa, was married to the king's courtier and favorite Gustav Olsson Stenbock (they were to be the parents of the king's third wife Catherine Stenbock) and the king's niece Brita