The relationship between her parents was said to be volatile with her father prone to drunken rages where her mother is reported to have thrown plates and glasses at her spouse during arguments. Altough Anna described as intellectually superior to her spouse, she was also considered temperamental and strong-willed.
In 1613 Johann Sigismund converted to Calvinism while his wife and daughters remained staunchly Lutheran.
In 1619 when Catherine was 16 years old her father died and was suceeded by her brother George William. The following year Catherines oldest sister Maria Eleonora was considered by a marriage candidate of the young Gustavus Adolphus of Sweden.
But because of their brothers refusal to allow their sisters marriage, their mother Anna (who was in favour of it) sent both sisters to the Braunschweig court where their older sister Anna Sophia (married to Frederick Ulrich, Duke of Brunswick-Lüneburg) lived. This was so Georg Wilhelm could not keep Maria Eleonora from leaving Brandenburg.
Then through the help of the Swedish Chancellor of the Exchequer Axel Oxenstierna both sisters accompanied by Oxenstierna and his mother Barbro Bielke left for Sweden.
Catherine and her mother then lived in Sweden for several years after the marriage of her sister Maria Eleonora to king Gustavus Adolphus of Sweden in 1620.
Catherine was educated to become an ideal consort of a ruler and was "richly decorated with virtues suitable to a princely woman".[1] As for her appearance although she was very short, she had a shapely figure and pleasing face.
Catherine had many important family connections that made her a very eligible bridal candidate.Not withstanding her sister being queen of Sweden, she was also a cousin of Frederick III of Denmark.
In 1626, her mother Anna died.
Princess consort of Transylvania
On 2 March 1626, she married Gabriel Bethlen, prince of Transylvania. The marriage allied the Protestant Prince of Transylvania with the Protestant powers of Denmark, Sweden and the Palatinate. A proxy marriage was celebrated in Berlin, after wich the bride set off accompanied by her sister Anna Sophia, for her new homeland, where a second marriage in person performed in Kosice in Transylvania (now in Slovakia) took pace. The couple settled in Alba Iulia in Transylvania.
The marriage is not described as happy. Gabriel Bethlen had numerous mistresses, and Catherine had lovers as well, most notably Istvan Csaky - because of the double standards of the time, however, only Catherine was given a bad reputation because of this.[2]
The marriage remained childless. It was a condition in the marriage contract that Catherine should be elected the successor of her spouse, and she was elected as his successor by Transylvania's Diet and swore her solemn oath as his successor on May-June 1626, after which her status was confirmed by the Ottoman Porte through the effort of the Dutch and English allies of Bethlen.[3] Bethlen confirmed her election in his political will, in which he noted "perhaps no other illustrious princely woman has ever been elected."[4]
Prince Gabriel Bethlen died on 25 November 1629.
Princess Regnant of Transylvania
Her policy was to bring Transylvania back under the influence of Holy Roman Emperor Ferdinand II. She tried in vain for a year to hold on to the throne, supporting herself on her favorite Istvan Csaky, but she was forced to abandon power on 21 September 1630.
Transylvanian Ducat of Catherine of Brandenburg 1630
Catherine of Hohenzollern moved back to Germany where she converted to Catholicism in 1633 and married Francis Charles of Saxe-Lauenburg in 1639. She died on 27 August 1649.
