Princess Cecilie of Greece and Denmark

Princess Cecilie of Greece and Denmark (Greek: Καικιλία, romanized: Kaikilía; 22 June 1911 – 16 November 1937) was by birth a Greek and Danish princess who became titular Hereditary Grand Duchess of Hesse and by Rhine through her marriage to Prince Georg Donatus, pretender to the throne of the Grand Duchy of Hesse. She was also the third-eldest sister to Prince Philip of Greece and Denmark (later Duke of Edinburgh).

Source: Wikipedia — Princess Cecilie of Greece and Denmark (CC BY-SA 4.0)