Marking the passing of Queen Elizabeth II, one social media poster dug all the way back to the tragedy of 9/11 to remind people that not even royal tradition is more sacred than an act of kindness.

After the terrorist attacks on September 11, 2001, The Queen ordered the Royal Guard to break a centuries-old tradition, in order to play the US national anthem during the Changing of the Guard at Buckingham Palace in London.

The user on Reddit known as ‘ledgendary' posted a video of the moment, saying The Queen was "attempting to provide some comfort to Americans who were stranded in London".

The monarch, who died this week at age 95, made the decision to break the tradition, which dated back to 1660, and allow her guards to play a foreign country's anthem outside of a state visit.

Seeing the moving moment, ABC news anchor Peter Jennings could barely keep it together after watching the news footage.

Watch the video below…

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