There were several notables absent from the coronation. the most important was Napoleon's mother who had sided with Joseph in an argument about Josephine. Joeph was also absent and Lucien and Jerome had been banned from the service. I would imagine the answer you seek would be his mother who was deliberately travelling slowly in order to avoid the ceremony. Trooper
I was going to say his Mom, too. What's this about Lucien and Jerome?
-Sandor
I remember reading that Madam Mere was absent not only because she disliked Josephine but because she sided with her son Jerome over his short-lived marriage to Elizabeth Patterson. Napoleon forcibly had this marriage annulled and I think Lucien also took sides against Napoleon on this matter.
Rgds Victor