Portuguese
During the early 20th century, Edmund B. Delabarre associated the Dighton Rock with the lost Portuguese navigators Miguel Corte-Real and his brother Gaspar. This Portuguese hypothesis has been supported more recently by Manuel Luciano DaSilva, who suggests that one of the Corte-Real brothers built the Newport Tower as a watchtower. The idea of Portuguese construction of the tower was also supported by former U.S. Ambassador Herbert Pell, who in 1948 argued that the tower resembles elements of the Convent of Tomar in Portugal.
Read more about this topic: Newport Tower (Rhode Island), Alternative Hypotheses