The Tower of Hercules has a valuable immaterial patrimony based on legends linked to its founding and history. These legends have not always been pondered or analyzed as products derived from the societies that created them. However they have been of outstanding relevance for historiography which, during the 16th, 17th, 18th, and 19th centuries, has attempted to explain its origins. Among all the legends the most remarkable ones are Breogan’s legend of Irish origin, the Greco-Roman tale of Hercules, and Trezenzonio’s legend which is a blend of both.

Two writers have devoted themselves to analysing with exhaustive rigour the importance of these accounts: José María Bello Diéguezand Francisco Javier González, who have sought to spread this rich intangible heritage.