At age 7 I was placed in the Northumbrian monastery of Saint Peter at Monkwearmouth, England, and became a monk at age 17.
Known as an author, scholar, linguist, and translator, you may wonder why I am appearing in the guise of a mathematician?
In my book De temporum ratione liber, the first chapter "On Computing and Speaking with the Fingers" explains the practice of finger reckoning, involving more than fifty finger symbols and allowing computations of numbers less than one million.
In that same book, I explained how a spherical earth influences the changing length of daylight, how the seasonal motion of the Sun and Moon influences the changing appearance of the New Moon, and posed a quantitative relation between tide changes and the moon's motion....ending with instructions for computing the date of Easter.
Venerable Bede (673 – 735)