Queen Elizabeth II was notably absent from multiple Platinum Jubilee events due to her "episodic mobility issues." Royal historian Robert Lacey explained the decision had to do with minimizing the distress the citizens of the British monarch might feel if she stumbled. "She would not want to stumble – not for her own sake but for the distress it would cause other people," Lacey told People magazine. However, her absence was even felt at events she did attend.