Her paternal grandparents were King Paul of Greece and Frederika of Hanover. Her maternal grandparents are Frederick IX of Denmark and Ingrid of Sweden. As an agnatic descendant of Christian IX of Denmark Theodora is a Danish Princess, and because King Christian's younger son, Prince william of Denmark, was elected "George I, King of the Hellenes" in 1863, her father (George's great-grandson) inherited the throne of Greece in 1964.
Theodora was born in 9 June 1983 at St Mary's Hospital, London.
Theodora attended the all-girls boarding institution, Woldingham School, situated in Surrey, England, between 1994 and 2001. After a gap year spent at St Philip's College in Alice Springs, Australia, Theodora attended Brown University under the name Theodora Greece, where she received her Bachelor of Arts on 28 May 2006 in Theatre Arts, having also attended Northeastern University in Boston. Subsequently she undertook graduate studies at Central Saint Martins College of Art and Design.
In April 2010, Theodora moved to Los Angeles to pursue an acting career, appearing in supporting roles under the name Theodora Greece. She made her television debut as secretary Alison Montgomery in the long-running soap opera, The Bold and the Beautiful, on December 5, 2011.
