Jan Jakob Maria de Groot

Jan Jakob Maria de Groot was a Dutch Sinologist and historian of religion. He taught at Leiden and later in Berlin, and is chiefly remembered for his monumental work, The Religious System of China, Its Ancient Forms, Evolution, History and Present Aspect, Manners, Customs and Social Institutions Connected Therewith. The two books of this detailed and wellillustrated treatise appeared in six volumes and, according to the preface in the first volume, the System was originally meant to include several more books.

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Source: Wikipedia