Médard Chouart Groseilliers, sieur des

Groseilliers, Médard Chouart, sieur des (mādärˈ shwär syör dā grôsāyāˈ) [key], 1618?–c.1690, French trader and explorer in North America. He was the brother-in-law of Pierre Esprit Radisson and his companion in his great journeys.

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