Albi Cathedral, formally the Cathedral Basilica of
Saint Cecilia (French:
Basilique Cathédrale Sainte-Cécile d'Albi), is the most important Catholic building in
Albi,
France, and the seat of the Roman Catholic
Archbishop of Albi (in full, Albi-Castres-Lavaur). First built as a fortress in the aftermath of the
Albigensian Crusade; begun in 1287 and under construction for 200 years, it is claimed to be the largest brick building in the world.