D'Albret, Jeanne, queen of Navarre, and mother of Henry IV. of France; came to Paris to treat about the marriage of her son to Charles IX.'s sister; died suddenly, not without suspicion of foul-play, after signing the treaty; she was a Protestant (1528‒1572).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Dalberg, Duc de * D'Alembert