He is married to Mária Filipina Eusebia Pálffy ab Erdöd.
They got married on July 6, 1700, he was 23 years old.
Child(ren):
Graf von Buquoy
https://gw.geneanet.org/flyne?lang=de&iz=1&p=charles+cajetan&n=de+longueval
Comte de Bucquoy, Seigneur de Gratzen
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AdelsSchematismus Des Österreichischen Kaiserstaates
by Ignaz Ritter von Schönfeld
Publication date 1825
https://archive.org/details/bub_gb_FwJTAAAAcAAJ/page/n64/mode/1up
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The data shown has no sources.