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In page Consequences of the Black Death:

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All social classes were affected, but the lower classes, living together in unhealthy places, were most vulnerable. Alfonso XI of Castile and Joan of Navarre (daughter of Louis X le Hutin and Margaret of Burgundy) were the only European monarchs to die of the plague,[citation needed] but Peter IV of Aragon lost his wife, his daughter and a niece in six months. Joan of England, daughter of Edward III, died in Bordeaux on her way to Castile to marry Alfonso's son Pedro. The Byzantine emperor lost his son, while in the Kingdom of France, Bonne of Luxembourg, the wife of the future John II of France, died of the plague. Simeon of Moscow and his brother likely died of the plague, along with Theognostus, the head of the Russian Church.[10]