The Austrian aristocracy is mourning a tragic loss.

Archduchess Estelle de Saint-Romain of Austria, married to Archduke Carl Christian, has died, her family confirmed in a statement. She was 46.

The statement, published March 8 in Le Figaro’s Carnet du Jour, noted that Estelle’s husband, children, parents and in-laws were “deeply saddened to announce the passing” of the Archduchess on March 4.

The statement did not include details about Estelle’s cause of death—though Point De Vue cites cancer—but it did note her funeral was held on March 11 at the Franciscan Monastery of Cimiez in Nice, France.

Estelle is survived by her husband and their five children, Zita, 17, Anezka, 15, Anna, 12, Paola, 10 and Pier-Giorgia, 4, all of whom were in attendance at her funeral, per Point De Vue. According to the outlet, also in attendance were d Princess Astrid of Belgium, Ferdinand of Habsburg, Princess Marie-Astrid of Luxembourg, and the Duke of Castro.