Johannes, 11th Prince of Thurn and Taxis (5 June 1926 – 14 December 1990) was a German businessman and head of the immensely wealthy, formerly princely Thurn und Taxis family from 1982 until his death.

Johannes was born in Regensburg, Germany, to Karl August, 10th Prince of Thurn and Taxis, and Infanta Maria Anna de Braganza. He had two older sisters and one younger brother.

The Thurn and Taxis family came to massive media attention during the late-1970s through mid-1980s when Johannes married the younger Countess Mariae Gloria of Schönburg-Glauchau, a member of a mediatised comital dynasty which still possessed large estates in Germany after World War I, but became refugees in Africa under the Nazi regime and fell on hard times. The couple's haut bohème lifestyle located them among the jet set and Princess Gloria's over-the-top appearance (characterized by bright hair color and flashy clothes) prompted Vanity Fair to describe her as "Princess TNT, the dynamite socialite", a sobriquet that stayed with her a long time. In the 1970s Johannes threw avant-garde parties and, because he was bisexual, he was often seen in gay discos.

On 31 May 1980 Johannes, Prince of Thurn and Taxis, married his 4th cousin twice removed, Countess Gloria of Schönburg-Glauchau. They are both descended from Karl Alexander, 5th Prince of Thurn and Taxis. They had three children:

Upon the death of his father in 1982, Johannes became the head of the Thurn and Taxis family. On 14 December 1990 he died, after two heart transplants within 2 days, in Munich-Großhadern. He left U.S. $500 million in debts and his widow sobered her lifestyle to master the fiscal responsibilities of probating his estate and securing what remained of her son's fortune.

...
Wikipedia