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Although the Cathedral of Lucca is not one of the largest churches built in Italy during the Middle Ages, it is nevertheless one of the most remarkable for its structure and one of the most beautiful, especially inside, thanks to the harmonious lines and the admirable balance between the fantastic and the severe, which gives the building a truly sacred and solemn character, achieved in equal measure by very few of those that surpass it in size and richness of ornamentation. (p. 5)
— ENRICO RIDOLFI