Breogán is a mythical king Celtic from Galicia. There are several versions of this character's story, including the legend is a 19th century creatione century, he has since been considered the mythological father of the Galician nation. The Galician hymn describes Galicia as the nation of Breogán.
Legend has it that the ancestors of Breogán arrived in Galicia, coming from Egypt to flee the plagues of the time of Moses. In all probability this legend was created in the Middle Ages, when there was already a great Christian tradition.
According to Irish tradition, repeated in a book of the XIe century, the Lebor Gabála Erenn (the Book of Conquests), which tells about the various invasions of Ireland, Breogán is the name of a mythical Celtic king of Galicia.
According to this legend, he built the Tower of Hercules (Torre de Hércules) in La Coruña. From which, still according to the legend, his son Ith sees Ireland and sets out to conquer it. Unfortunately, he is murdered. In revenge, the sons of Mile, son of Bile and therefore grandsons of Breogán and grand-nephews of Ith, sail from Galicia to Ireland to conquer it.