Clement VII receives the Duke of Anjou at Avignon, in a 15th-century manuscript.Image: Giac Master · Public domainThe Western Schism begins
On 20 September 1378 at Fondi, the French cardinal Robert of Geneva was elected as Clement VII, beginning the Western Schism that split the Roman Church for about forty years. A group of cardinals had retired to Anagni after the election of Urban VI, arguing that it had been made under fear. Clement could not hold Italy and settled at Avignon, where he depended on the French court.
Source: Encyclopaedia Britannica: Clement (VII), antipope ↗
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