Barbara of Brandenburg

Barbara von Brandenberg, of the House of Hohenzollern, married Henry XI Duke of Glogow, October 11, 1472, her second partner was King Wladyslaw II Jagiellon (of Bohemia) (1456-1516) she married him on August 20, 1476. http://familypedia.wikia.com/wiki/Barbara_von_Brandenburg_(1464-1515).

https://en.wikipedia.org/wiki/Barbara_of_Brandenburg_(1464–1515)

She gets secretly engaged to a Franconian knight named Conrad of Heideck in 1493, which leads to her imprisonment in Plassenburg castle. -Barbara is the tenth of nineteen children.
-She was 8yrs old when she married the Silesian Duke, Henry XI of Glogow.
-This John Barber could have married one of the other children, but the dates match Barbara's, so that is impossible.
-There is only one thing even in favor of me being related to the Brandenburgs and that is my DNA test, which says that two living Brandenburgs in the United States are my 3rd - 5th cousins with medium confidence. However, this connection could come from my fathers mothers side or from my mother's side of the family. --Robert Jeffers