The height of the reign was the coronation, 16 months after the succession, followed by years of high popularity and a blindly patriotic, enthusiastic press. The relationship with the media kept intensifying, including the introduction of annual Christmas messages on BBC radio and TV. Princess of Wales Lady Di overtook center stage in her modern style. The role of the other royals, who learn on the job, varied over the years, but overall monarchy remains popular enough to survive in most realms. Crucial in international relations is the undefined position of head of the Commonwealth, not guaranteed to future sovereigns.