Why did Archbishop Robert Winchelsey refuse Edward I's demand for taxes from the clergy?

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Archbishop Robert Winchelsey refused King Edward I’s demands for clerical taxes in 1297 because he was strictly adhering to the papal bull Clericis Laicos, issued by Pope Boniface VIII in 1296.12

This papal decree explicitly forbade the clergy from paying taxes to lay rulers without express permission from the papacy. As a staunch defender of ecclesiastical liberties and clerical privilege, Winchelsey felt compelled to obey the Pope’s mandate over the King’s financial requirements for his ongoing foreign wars.132

In retaliation for this defiance, Edward I outlawed the entire English clergy, effectively stripping them of legal protection. The dispute eventually eased later in 1297 when Pope Boniface VIII permitted clerical taxation specifically for the purposes of national defense.12