Moment Queen Elizabeth II bowed head to Princess Diana as her coffin went past

The Queen was a stickler for tradition, so much so that she broke this cardinal royal rule just once during her 70-year reign.The Royal Family is so steeped in tradition and protocol that its members were taught royal etiquette by household staff from a young age.The most important rule is to bow (or curtsey) to the monarch, in this case Queen Elizabeth II. The monarch bows to no one.But on the day of Princess Diana 's funeral on September 6, 1997, while standing with her family, the Queen bowed her head as the cortege passed.