Context: Parisian examples of European architecture date back more than a millennium; including the Romanesque architecture church of the Abbey of Saint-Germain-des-Prés (1014–1163); the early Gothic Architecture of the Basilica of Saint-Denis (1144), the Notre Dame Cathedral (1163–1345), the Flamboyant Gothic of Saint Chapelle (1239–1248), the Baroque churches of Saint-Paul-Saint-Louis (1627–1641) and Les Invalides (1670–1708). The 19th century produced the neoclassical church of La Madeleine, Paris (1808–1842); the Palais Garnier Opera House (1875); the neo-Byzantine Sacré-Cœur, Paris (1875–1919), and the exuberant Belle Époque modernism of the Eiffel Tower (1889). Striking examples of 20th-century architecture include the Centre Georges Pompidou by Richard Rogers and Renzo Piano (1977), and the Louvre Pyramid by I. M. Pei (1989). Contemporary architecture includes the Musée du quai Branly - Jacques Chirac by Jean Nouvel (2006), the contemporary art museum of the Louis Vuitton Foundation by Frank Gehry (2014)., and the new Tribunal de Justice by Renzo Piano (2018).

Question: Which was built first, the Basilica of Saint Denis or the Notre Dame Cathedral?

Answer:
Basilica of Saint-Denis