Leonard, an eminent mathematician in the sixteenth century, was descended from an ancient family, and born at Digges Court, in the parish of Barham in Kent, but in what year is not known. He was educated at Oxford, where he laid a good foundation of learning; and having retired from thence, he prosecuted his studies, and became an excellent mathematician, a skilful architect, and an expert surveyor of land. He composed several works, as, 1. Tectonicum, briefly showing the exact Measuring and speedy Reckoning of all manner of Lands, Squares, Timber, Stones, Steeples, &c. 1556, 4to; 2. A Geometrical Practical Treatise, named Pantometria, in three books, which he left in manuscript, but which after his death was published by his son in 1591, folio; 3. Prognostication Everlasting of right good effect, or Choice Rules to judge the weather by the Sun, Moon, and Stars, &c. in 4to, 1555, 1556, and 1564; corrected and augmented by his son, with divers general tables, and many compendious rules, in 4to, 1592. He died about the year 1574.