Archduchess Renate of Austria was a daughter of Archduke Charles Stephen of Austria and a first cousin of King Alphonso XIII of Spain. A member of the Teschen branch of the House of Habsburg-Lorraine and an Archduchess of Austria and Princess of Bohemia, Hungary, and Tuscany by birth, she renounced her titles in 1909 upon her marriage to Prince Jerome Radziwiłł.

Archduke Charles Stephen Eugene Viktor Felix Maria of Austria was a member of the House of Habsburg, a Grand Admiral in the Austro-Hungarian Navy and candidate for the Polish crown.