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Mary's ancestors fled Holland in 1572 when Nicasius Janssen, Baron de Heeze was hanged by Dutch pirates. Her father, Theodore Janssen was a wealthy British corporate director and politician


Dandridge
John Dandridge (1700 - 1756)
Martha Dandridge (1731 - 1802)

deFoix
Louise deFoix

deHeeze
Baron deHeeze (1522 - 1572)
Theodore Janssen deHeeze