What family lineage was XXX part of?
Archduke Charles Stephen of Austria
Archduke Charles Stephen of Austria (German: Erzherzog Karl Stephan von Österreich, Polish: Arcyksiążę Karol Stefan Habsburg) (5 September 1860 -- 7 April 1933) was a member of the House of Habsburg, a Grand Admiral in the Austro-Hungarian Navy and candidate for the Polish crown.
House of Habsburg