Some Interesting facts about Notre Dame de Paris from Wikipedia:

1170: Existence of a cathedral school operating at Notre-Dame. This corporation of teachers and students will evolve in 1200 into the University of Paris in an edict by King Philippe-Auguste.

1185: Heraclius of Caesarea calls for the Third Crusade from the still-incomplete cathedral.

1239: The Crown of Thorns is placed in the cathedral by St. Louis during the construction of the Sainte-Chapelle.

16 December 1431: Henry VI of England is crowned King of France.

7 November 1455: Isabelle Romée, the mother of Joan of Arc, petitions a papal delegation to overturn her daughter's conviction for heresy.

18 August 1572: Henry of Navarre (later Henry IV of France) marries Margaret of Valois. The marriage takes place not in the cathedral but on the parvis of the cathedral, as Henry IV is Protestant.

2 December 1804: the coronation ceremony of Napoleon I and his wife Joséphine, with Pope Pius VII officiating.

1831: The novel The Hunchback of Notre-Dame was published by French author Victor Hugo.

26 August 1944: The Te Deum Masstakes place in the cathedral to celebrate the liberation of Paris. (According to some accounts the Mass was interrupted by sniper fire from both the internal and external galleries.)

12 November 1970: The Requiem Mass of General Charles de Gaulle is held.

26 June 1971: Philippe Petit surreptitiously strings a wire between the two towers of Notre-Dame and tight-rope walks across it. Petit later performed a similar act between the Twin Towers of the World Trade Center.

January 1996: The Requiem Mass of François Mitterrand is held.

10 August 2007: The Requiem Mass of Cardinal Jean-Marie Lustiger, former Archbishop of Paris and famous Jewish convert to Catholicism, is held.

21 May 2013: Around 1,500 visitors were evacuated from Notre-Dame Cathedral after Dominique Venner, a historian, placed a letter on the Church altar and shot himself. He died immediately.

8 September 2016: Notre Dame Cathedral bombing attempt. Arrests made after an explosives-filled car was discovered parked alongside the cathedral.

10 February 2017 Police arrested 4 people in Montpellier, France, including a 16-year-old girl and a 20-year-old man already known by authorities to have ties to extremist Islamist organizations, on charges of plotting to travel to Paris and attack the cathedral.

6 June 2017 2017 Notre Dame attack Lone attacker armed with hammer arrested for attacking police officer outside the Cathedral.