Maria Antonia was the mother of Prince Xavier. She was a member of the House of Braganza, a royal family of Portuguese origin. Maria Antonia married Prince Leopold of Saxe-Coburg and Gotha in 1832, and they had four children together, including Prince Xavier.
Prince Xavier, Hereditary Duke of Parma Quiz: How Much Do You Really Know About Prince Xavier, Hereditary Duke of Parma?