Ex-Queen Helen of Romania leaves London airport for Geneva 18th August 1954 Princess Elena (Helen) of Greece and Denmark was born on May 2, 1896 in Athens, the third child of the King Constantine I, King of the Hellenes and his Queen, Sophie Dorothea Ulrica of Prussia. On March 10, 1921 she married Carol, then Crown Prince of Romania, at Athens as per custom in the Greek royal family. The marriage ended in divorce in 1928.