Question: The owner of the painting The Madonna del Granduca held what title from 1805-1814?

Context paragraphs:
Madonna del Prato (Raphael): The Madonna with the Christ Child and Saint John the Baptist is a 1506 painting by Raphael, now held in the Kunsthistorisches Museum in Vienna.  It is also known as Madonna del prato ("Madonna of the Meadow") or Madonna del Belvedere (after its long residence in the imperial collection in the Vienna Belvedere).

Madonna of the Rose Garden: The Madonna of the Rose Garden (Italian: "Madonna del Roseto") is an International Gothic painting attributed to Michelino da Besozzo or Stefano da Verona.  Dating to c. 1420–1435, it is currently housed in the Castelvecchio Museum of Verona, northern Italy.

Locarno–Madonna del Sasso funicular: The Locarno–Madonna del Sasso funicular, or Funicolare Locarno–Madonna del Sasso (FLMS) is a funicular railway near the city of Locarno in the Swiss canton of Ticino.  The line links a lower station in the city center with the pilgrimage site of the Sanctuary of the Madonna del Sasso and the municipality of Orselina.  It forms part of the route to the summit of nearby Cimetta mountain.

Madonna del cardellino: The Madonna del cardellino or Madonna of the Goldfinch is a painting by the Italian renaissance artist Raphael, from c. 1505-1506.  A 10-year restoration process was completed in 2008, after which the painting was returned to its home at the Uffizi in Florence.  During the restoration, an antique copy replaced the painting in the gallery.

Madonna del Granduca: The Madonna del Granduca is a Madonna painting by the Italian renaissance artist Raphael.  It was probably painted in 1505, shortly after Raphael had arrived in Florence.  The influence of Leonardo da Vinci, whose works he got to know there, can be seen in the use of sfumato.  The painting belonged to Ferdinand III, Grand Duke of Tuscany, from whom it got its name.

Madonna of the Book: The Madonna of the Book, or the Madonna del Libro, is a small painting by the Italian Renaissance artist Sandro Botticelli, and is preserved in the Poldi Pezzoli Museum in Milan.  The painting is executed in tempera on panel.  It dates from between 1480 and 1483.

Madonna del Bordone: The Madonna del Bordone (‘The Madonna of the pilgrim's staff’) is a panel painting by the Italian painter Coppo di Marcovaldo, in the church of Santa Maria dei Servi in Siena, Italy.

Sanctuary of Madonna del Sasso: The Madonna del Sasso sanctuary is on a spur over the Lake Orta at 638 m height, in the Madonna del Sasso municipality.  From the square in front of the church, called "the Cusio's balcony", there is a great view on the lake, the Mottarone, the Alps and the Novara area.

Ferdinand III, Grand Duke of Tuscany: Ferdinand III (German: "Ferdinand Josef Johann Baptist"; Italian: "Ferdinando Giuseppe Giovanni Baptista"; English: "Ferdinand Joseph John Baptist"; 6 May 1769 – 18 June 1824) was Grand Duke of Tuscany from 1790 to 1801 and, after a period of disenfranchisement, again from 1814 to 1824.  He was also the Prince-elector and Grand Duke of Salzburg (1803–1805) and Grand Duke of Würzburg (1805–1814).

Madonna del Parto: A Madonna del Parto ("Madonna of Parturition") is an iconic depiction of the Virgin Mary shown as pregnant, which was developed in Italy, mainly in Tuscany in the 14th century.  Examples include works by Taddeo Gaddi, Bernardo Daddi and Nardo di Cione.  The Madonna was portrayed standing, alone, often with a closed book on her belly, an allusion to the Incarnate Word.  The works were associated with the devotions of pregnant women, praying for a safe delivery.  Sometimes, as with a statue by Sansovino in the Basilica of Sant'Agostino in Rome, the depiction is of a Virgin and Child, but known as a Madonna del Parto because it was especially associated with devotions over pregnancy.  Here the Virgin wears the Girdle of Thomas, a belt of knotted cloth cord that was a relic held in Prato Cathedral, which many depictions wear.

Supporting paragraphs: Madonna del Granduca Ferdinand III, Grand Duke of Tuscany
Answer: Grand Duke of Würzburg