With the project of this lighthouse would be signalized the entrance to the estuary of Pontevedra and Marín.
A first project was carried out between 1861-1865 by Elduayen and Garcia del Hoyo, and began operating in April 1865 with a fifth-order retro-reflecting apparatus with an ordinary 12-mile reach.
As in other Galician lighthouses it was necessary to remodel it to modify its characteristics, dilating the process of the new lighthouse until 1926.
In the last years, it was automated. Currently it maintains a range of 25 miles.
Curiosities, myths and legends
The typical ship of Ons are the dornas whose origin is related to the Norman ships that invaded our coasts in the s. X-XI.
The adaptation to our environment gave rise to a craft boat of wood of wide sleeve and very stable that is handled by rowing or sailing. The adoption of the dorna to each family marked the passage from the family fishing to the cooperativism, forming part of the crew three men and a waiter.
The "xeiteiras" are dornas older than 5 or 6 m in length for fishing the sardine. The "polveiras" are dornas smaller than 3 or 4 m for the fishing of the octopus.
