Calmindon, the Light-Tower, was one of the many works of the future King Tar-Aldarion of Númenor.

The tower was erected on the Island of Tol Uinen, in the Firth of Romenna, as part of the works built to celebrate the 100th anniversary of the founding of the Guild of Venturers by Aldarion. This was in the days when Aldarion was betrothed to Erendis and served as Lord of Ships and Havens for his father Tar-Meneldur Elentirmo.
Encyclopedia entry originally written by PotbellyHairyfoot