The Nuttall Encyclopedia
Son of the preceding, born either in Venice or Bristol; accompanied his father to N. America; sought service as a navigator, first in Spain then in England, but failed; returned to Spain; attempted under Charles V. to plant colonies in Brazil with no success, for which he was imprisoned and banished; was the first to notice the variation of the magnetic needle, and to open up to England trade with Russia (1474-1557).
Wood, James, ed. Entry for 'Cabot, Sebastian'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/c/cabot-sebastian.html. Frederick Warne & Co Ltd. London. 1900.