The name of the ruler alluded to is not indeed introduced into the actual text, but "Carolus Inlperator" form the initial letters of the passage dealing with this subject.
According to the Frankish custom he proclaimed a king in Austrasia in the person of the young Clotaire IV., but in reality Charles was the sole master - the entry in the annals for the year 717 being "Carolus regnare coepit."
Thus, in 1611 or the following year whalers from Hull named it Trinity Island; in 1612 Jean Vrolicq, a French whaler, called it Ile de Richelieu; and in 1614 Joris Carolus named one of its promontories Jan Meys Hoek after the captain of one of his ships.
A second (inferior) edition of this work was published by Carolus Manolessius.
He there shows that the cycloid was investigated by Carolus Bovillus about r 500, and by Cardinal Cusanus (Nicolaus de Cusa) as early as 1451.