Sorry, don't know, Eric.
I' d like to tell an interesting story about Michael. The time he reigned under the regency of his uncle Nicolas, gossips claimed that he was born deaf and dumb. Also his mother, Princess Helen, desperate and exasperated by this crazy rumor that was a disservice to the crown, one day took the decision to open the wing of the palace in Bucharest, where she lived with her son to receive politicians, journalists, and many others for the sole purpose that they might see themselves as the Child-King was normal. And it spoke so much, and with so much appropriateness despite his young age, that the odious legend was destroyed.
This curious legend is not unique. Well before the war of 1914, another royal child was supposed dumb by the people : It was the Kaiser's own daughter, Princess Victoria Louise, that many Germans, it is unclear why, decked thought the same handicap.