Toulon Cathedral , also known as Sainte-Marie-Majeure, is a Roman Catholic church located in Toulon, in the Var department of France. The cathedral is a national monument. Construction of the church began in the 11th century and finished in the 18th century. From the 5th century onwards, it was the seat of the Bishops of Toulon, and since 1957 has been the ecclesiastical seat of the Diocese of Fréjus-Toulon.