Who was the older brother of person whose guard formed the French Royal Guard?
Dutch grenadiers The Dutch grenadiers were a French guard regiment from 1810 until 1813. They were originally formed out of Louis Bonaparte's Royal guard.
Paul Hay du Chastelet Paul Hay du Chastelet (November 1592 – 26 April 1636) was a French magistrate, orator and writer. His brother Daniel Hay du Chastelet de Chambon was a mathematician.