This is a much later printing of his elements, of Euclid's elements. But you would be amazed how much of modern geometry has been described by Euclid. Even your geometry textbook can trace it back directly to Euclid's elements. Abraham Lincoln famously learned every proof in Euclid's elements in order to fine tune his mind. So you can really view Euclid as the father of geometry. But that's not all. There are many other contributors in philosophy and math.