The earliest mention of animal testing is in the writings of the Greeks in the second and fourth centuries BCE. Aristotle (�����������) (384 – 322 BCE) and Erasistratus (304 – 258 BCE) where some of the first people to try out experiments on living animals. Galen, a doctor in second-century Rome who was known as the "father of vivisection", dissected pigs and goats. Avenzoar, an Arabic doctor in twelfth-century Spain, tested out surgical processes on animals before applying them to humans.