Who married Archduchess Helena of Austria?

Archduchess Helena of Austria (full German name: Helena Marie Alice Christine Josefa Anna Margareta Madeleine Walburga Blandina Cäcilie Philomena Carmela Ignatia Rita de Cascia, Erzherzogin von Österreich, Prinzessin von Toskana; 30 October 1903 – 8 September 1924) was a member of the Tuscan branch of the House of Habsburg-Lorraine and an Archduchess of Austria and Princess of Bohemia, Hungary, and Tuscany by birth. Through her marriage to Philipp Albrecht, Hereditary Duke of Württemberg, Helena was also a member of the House of Württemberg and Hereditary Duchess consort of Württemberg.

Philipp Albrecht, Duke of Württemberg (born Georg Philipp Albrecht Carl Maria Joseph Ludwig Hubertus Stanislaus Leopold Herzog von Württemberg; 14 November 1893 – 15 April 1975) was the son of Albrecht, Duke of Württemberg, and Archduchess Margarete Sophie of Austria. He was born in Stuttgart, and became head of the formerly reigning royal House of Württemberg on the death of his father on 29 October 1939. He died in Ravensburg, aged 81.