Poissy, Colloquy of (pwäsēˈ) [key], 1561, conference of Roman Catholic prelates and Protestant ministers, initiated by Catherine de' Medici and Michel de L'Hôpital in the hope of bringing about a peaceful reunion of the two communions. The conference was unsuccessful as a result of the opposition of both parties to compromise on essential points. Those present included Theodore Beza, Pietro Martire Vermigli, Diego Lainez, and Charles de Guise, Cardinal de Lorraine.
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