Who married Marguerite von Bismarck?

Nikolaus Heinrich Ferdinand Herbert, Prince of Bismarck (born Nikolaus Heinrich Ferdinand Herbert Graf von Bismarck-Schönhausen; 28 December 1849 – 18 September 1904) was a German politician, who served as Foreign Secretary from 1886 to 1890. His political career was closely tied to that of his father, Otto von Bismarck, and he left office a few days after his father's dismissal. He succeeded his father as the 2nd Prince of Bismarck in 1898. He was born in Berlin and died in Friedrichsruh.