posting info from wiki in various posts
Timeline of construction
1160 Maurice de Sully (named Bishop of Paris) orders the original cathedral demolished.
1163 Cornerstone laid for Notre-Dame de Paris; construction begins.
1182 Apse and choir completed.
1196 Bishop Maurice de Sully dies.
c.1200 Work begins on western facade.
1208 Bishop Eudes de Sully dies. Nave vaults nearing completion.
1225 Western facade completed.
1250 Western towers and north rose window completed.
c.1245–1260s Transepts remodelled in the rayonnant style by Jean de Chelles then Pierre de Montreuil.
14th century New flying buttresses added to apse and choir.
In 1548, rioting Huguenots damaged some of the statues of Notre-Dame, considering them idolatrous.[12] During the reigns of Louis XIV and Louis XV, the cathedral underwent numerous alterations to comply with the more classical style of the period. The sanctuary was re-arranged; the choir was largely rebuilt in marble, and many of the stained glass windows from the 12th and 13th century were removed and replaced with white glass windows, to bring more light into the church. A colossal statue of St Christopher, standing against a pillar near the western entrance and dating from 1413, was destroyed in 1786. The spire, which had been damaged by the wind, was removed in the second part of the 18th century.
In 1793, during the French Revolution, the cathedral was rededicated to the Cult of Reason, and then to the Cult of the Supreme Being. During this time, many of the treasures of the cathedral were either destroyed or plundered. The twenty-eight statues of biblical kings located at the west facade, mistaken for statues of French kings, were beheaded.[13] Many of the heads were found during a 1977 excavation nearby, and are on display at the Musée de Cluny. For a time the Goddess of Liberty replaced the Virgin Mary on several altars.[14] The cathedral’s great bells escaped being melted down. All of the other large statues on the facade, with the exception of the statue of the Virgin Mary on the portal of the cloister, were destroyed.[6] The cathedral came to be used as a warehouse for the storage of food and other non-religious purposes[12]
In July 1801, the new ruler, Napoleon Bonaparte, signed an agreement to restore the cathedral to the Church. It was formally transferred on April 18, 1802. It was the setting of Napoleon’s coronation as Emperor on December 2, 1804, and of his marriage to Marie-Louise of Austria in 1810.