948.
V.Of the marriage of John de Groot with Alida Averschie was born the celebrated Hugo de Groot, better known by the name of Grotius: he was the first fruit of their coming together.

Almost all who have mentioned his birth[8] fix it on the tenth of April 1583.

The President Bouhier pretends they place it a year too late; and that he was born on the tenth of April 1582.

To prevent the authority of such a learned man, which has already seduced several writers, from misleading others, we shall shew that by departing from the general opinion he has fallen into an error.

Grotius writes to Vossius on Easter Sunday 1615[9], that on that day he reckoned thirty-two years: He dates another letter[10] to Vossius the twenty-fifth of March 1617; Easter-eve, "which, he observes, begins my thirty-fifth year." April 11, 1643, he says he had completed sixty years[11].