May she rest in peace,' Seville mayor Juan Ignacio Zoido said in a message on his official Twitter account.
The Duchess' royal family tree can be traced back to King James II and Arabella Churchill - the daughter of Sir Winston Churchill, who was also an ancestor of the British Prime Minister.
Instead, the Duchess - who is a direct royal descent from King James II of England - has left her entire estate to her six children, with them each receiving a palace, as well as thousands of acres of land.
Her eight grandchildren are also said to have inherited a substantial chunk of her estate.
Initial optimism about a possible recovery quickly receded, and she died early this morning, with her six children and third husband at her side.
Her family communicated the news of her death to King Felipe and the royal family, while the Mayor of Seville, Juan Ignacio Zoido, announced the news to the general public on Twitter.
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