Cathedral of The Sea (La Catedral Del Mal) is a 2018 Spanish show that has 8 episodes and is based on a book by Ildefonso Falcones from 2006 (which has a follow up named Los herederos de la tierra/The Heirs of the Earth). It’s a rag-to-riches story set in a tumultuous era: plague, inquisition and anarchy.
In the heart of medieval Barcelona, from the Great Plague to the Inquisition, Arnau, a young peasant, endures the worst torments and humiliations to become a free man. His extraordinary destiny will make him the hero of a whole people. In the fourteenth century, to the rhythm of the construction of the church Santa María del Mar - masterpiece of Catalan Gothic built “for the people and by the people” in record time (fifty-seven years), Arnau Estanyol tries to conquer his freedom.