Regarding March 21-March 23, 2013 speculations, 8 new bells will be rung for the first time at Notre-Dame de Paris for Palm Sunday

The official beginning of the 850th anniversary of Notre-Dame de Paris started on 12/12/12. Regarding the date March 23, what's quite funny is that the name of Paris archbishop is André Vingt-Trois (Andrew Twenty Three !...):

"Notre Dame's new bells will go on display in February and are scheduled to be rung for the first time on March 23, 2013.

Speaking outside the cathedral before celebrating Mass, the archbishop said Notre Dame de Paris is "a symbol for Parisians and for people across the world."

After the Mass, French Interior Minister Manuel Valls spoke in front of the huge wooden doors of the cathedral's Portal of the Last Judgment.

Noting that the cathedral had survived the reigns of "80 kings, two emperors and five republics," Valls said the cathedral's 850th anniversary "is moving for all who see in its towers the image of France in all its greatness."

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