Famous royalty in Europe often used assumed names so they wouldn't be killed as they traveled as the world was much more dangerous in the 1700s

These are some of the names the Comte De Saint Germain used in Europe during the 1700s. 

Other names	Marquess of Montferrat (Fr. Marquis de Montferrat), Count Bellamarre (Fr. Comte Bellamarre), Knight Schoening (Fr. Chavelier Schoening), Count Weldon, Count Soltikoff (Fr. Comte Soltikoff), Manuel Doria, Graf Tzarogy, Prince Ragoczy (Ge. Prinz Ragoczy)

end partial quote from Wikipedia regarding the Comte De Saint Germain.