It will not go unnoticed that Queen Rania is a Muslim.
In his five months as pontiff, Francis has washed the feet of at least one Muslim woman and has now bowed before a Muslim queen.
Francis made no discernable bow toward her husband, the king.
His acts of humility offer the world a unique kind of inter-faith dialogue.
A Vatican official later was reported to have said, "Pope Francis is not interested in protocol."