What title does Napoleon give himself in the book Animal Farm?

In George Orwell's book, "Animal Farm," Napoleon, the pig who emerges as the leader of the farm after the animals overthrow Mr. Jones, gives himself the title of "Leader." As he consolidates his power and control over the other animals, he starts to adopt more and more human-like behaviours and titles. Later in the book, he declares himself as "President" of the Animal Farm, signalling his complete transformation into a tyrannical dictator.