PARIS — The cathedral of Notre Dame — French for “our lady” — has finally got the prima donna worthy of its name.

Weighing in at six and a half tons or 6,000 kilograms of glistening bronze, this lady is no ordinary person: she’s a bell named Mary.

Mary is in fact the largest — and loudest — of nine new, gargantuan Notre Dame bells being blessed Saturday in the cathedral’s nave by Archbishop Andre Armand Vingt-Trois....