“Etre connu comme le loup blanc” means “être très connu” or in English, “to be very famous”.
Origin: Wolves were traditionally feared animals on various levels so humans stayed aware of them at all times. If a pack of wolves was to come close to a village, everyone would immediatly know about it. Wolves being mostly dark, grey or black, a white wolf would have been even more “famous” than a darker one.
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