Emperor Heizei
809 (Daidō 4, 1st month): After a reign of four years, Heizei fell ill and he feared that he would die. Heizei abdicated in favor of his younger brother  who would be known as Emperor Saga.  After abdicating, Heizei moved to Nara; and he was known as the "Emperor of Nara" (Nara no Mikado).