Several of the most influential Greek philosophers and thinkers are portrayed in Raphael’s masterpiece the School of Athens, which adorns the Apostolic Palace in the Vatican.

Painted between 1509 and 1511, it portrays a congregation of philosophers, mathematicians, and scientists from Ancient Greece, including Plato and Aristotle. But did you know that, in addition to the two philosophers in the center of the painting, there are six more “hiding”?

In his work, Raphael desired to pay his deepest tribute to the greatest philosophers in history, several of whom had tried throughout their lives to discover the prime mover, or cause, in the universe, a branch of thought known as the “knowledge of the first causes.”

It also shows sculptures of the Greek gods Athena, portrayed as the Roman goddess Minerva, representing Wisdom, and Apollo, representing Light and Music, in a direct nod to the greatness of Greek mythology and its contributions to the Western world. In short, Raphael’s painting is the Who’s Who of ancient Greek culture.

Who are the ancient Greek philosophers in Raphael’s painting?

Plato and Aristotle

The two main figures in the work are placed directly under the archway and in the fresco’s vanishing point, a compositional trick meant to draw the viewer’s eye to the most important part of the painting. Here, we see two men who effectively represent the different schools of philosophy—Plato and Aristotle.

An elderly Plato stands on the left, pointing his finger to the sky. Beside him is his student, Aristotle. In a display of superb foreshortening, Aristotle reaches his right arm directly out toward the viewer. Each man holds a copy of their books in their left hand—Timaeus for Plato and Nicomachean Ethics for Aristotle.

Socrates, the founder of Western philosophy

To the left of Plato, Socrates is recognizable thanks to his distinct features. It is said that Raphael was able to use an ancient portrait bust of the philosopher as his guide.

Among the crowd surrounding Socrates are his students, including the general Alcibiades and Aeschines of Sphettus.

Socrates is credited as the founder of Western philosophy and was among the first moral philosophers of the ethical tradition of thought.

Pythagoras, the theorist of metempsychosis

In the foreground, Pythagoras sits with a book and an inkwell, also surrounded by students.

The influence of Pythagoras in mathematics and philosophy remains indisputable to this day. His philosophy influenced both Plato and Aristotle, and through them, his ideas became fundamental to Western philosophy.

The teaching most securely identified with Pythagoras is metempsychosis, or the “transmigration of souls,” which holds that every soul is immortal and, upon death, enters into a new body.

Euclid, the father of geometry

Mirroring Pythagoras’ position on the other side, Euclid, considered the “father of geometry,” is bent over demonstrating something with a compass. His young students eagerly try to grasp the lessons he’s teaching them.

Euclid is chiefly known for the Elements treatise, which established the foundations of geometry that largely dominated the field until the early 19th century.

Ptolemy, the great mathematician and astronomer

The great mathematician and astronomer Ptolemy is right next to Euclid, with his back to the viewer. Wearing a yellow robe, he holds a terrestrial globe in his hand. It is believed that the bearded man standing in front of him holding a celestial globe is the astronomer Zoroaster.

Ptolemy wrote about a dozen scientific treatises, some of which were of importance to later Byzantine, Islamic, and Western European science.

Diogenes: The ancient Greek philosopher of cynicism

Diogenes was the founder of the philosophy of Cynicism and was a controversial figure in his day, living a simple life and criticizing cultural conventions.

Diogenes the Cynic (also known as Diogenes of Sinope) could have been the first anarchist, absurdist, satirist, or naturalist—depending on the reader’s point of view. By today’s standards, Diogenes was a homeless man by choice, and his life goal was the search for wisdom.

Heraclitus: The Greek philosopher of wisdom

Heraclitus was an ancient Greek pre-Socratic philosopher from the city of Ephesus, then part of the Persian Empire. He saw the world as constantly in flux, changing as it remained the same, and expressed this in saying, “No man ever steps in the same river twice.”

He was a self-taught pioneer of wisdom and a melancholy character who did not enjoy the company of others, making him one of the few isolated characters in the fresco.

Ancient Greeks held deep respect and affection for animals, believing they possessed reason, intelligence, and emotion, even as they hunted and sacrificed them to the gods. Greek literature and philosophy reveal a culture that viewed animals not merely as property but as living beings connected to humanity through thought, feeling, and shared experience.

Among the ancient thinkers who reflected most passionately on the treatment of animals was the historian Plutarch, whose writings remain among the strongest defenses of animals in the ancient world. Long before modern debates over animal welfare emerged, Plutarch argued that animals possessed intelligence and emotion and that cruelty toward them degraded the human soul itself. His ideas did not exist in isolation. Rather, they grew out of a broader Greek tradition in which animals occupied an honored place in religion, philosophy, daily life, and even familial affection.

The Ancient Greeks lived closely alongside animals in nearly every aspect of life. Dogs guarded homes and accompanied hunters, while horses symbolized nobility and courage. Birds were kept for pleasure, and cats, although less common than in Egypt, were sometimes used to control pests. Greek children played with pets, and wealthy households often treated favored animals as cherished members of the family.

Pet tombstones reveal Ancient Greeks loved their animals

Archaeological discoveries confirm the deep emotional attachment Ancient Greeks felt toward their pets. Tombstones dedicated to dogs, horses, and birds have been uncovered throughout the Greek world, and some inscriptions mourn animals with the same tenderness reserved for human relatives. One epitaph for a dog named Parthenope expresses grief in deeply personal language, demonstrating that the death of a beloved pet could inspire genuine sorrow. Greeks occasionally buried pets beside their owners or placed them in carefully prepared graves filled with offerings and decorations. These burials suggest that companionship with animals was not merely practical but also emotional and spiritual.

This affection appears vividly in Greek literature. In the Odyssey, the old dog Argos waits faithfully for Odysseus for twenty years. When Odysseus finally returns home in disguise, Argos recognizes him immediately before dying. The scene is brief yet unforgettable because Homer portrays the dog as capable of loyalty, memory, and emotional recognition. The moment suggests that Ancient Greeks understood animals as creatures capable of deep attachment.

Greek mythology likewise reflected admiration for animals. The owl symbolized wisdom through its association with Athena, while dolphins were regarded as intelligent and sacred creatures connected to Apollo and Poseidon. Horses were honored in myths surrounding heroic figures such as Achilles. Even the gods themselves frequently appeared in animal form, suggesting a sacred bond between humanity, divine power, and the natural world. One of the most famous examples is Zeus transforming himself into a magnificent white bull to carry away Europa.

Greek philosophers on animals

The philosophical discussion of animals became especially significant among thinkers associated with Pythagoras. Pythagoras himself believed souls could migrate between humans and animals through reincarnation. Because of this belief, he discouraged the eating of meat and taught respect for all living creatures. According to ancient tradition, he once intervened to stop a man from beating a dog, claiming he recognized the voice of a deceased friend within the animal.

Pythagoras was firmly opposed to killing “living creatures,” abstaining from what ancient sources describe as “harsh-sounding bloodshed,” including animal sacrifice, and reportedly “never eating meat.” In this sense, he is often regarded as the first Greek vegetarian. None of his original writings survive today, but his ideas are known through later authors such as Philolaus, Iamblichus, Ovid, and Plutarch.

Across these accounts, it becomes clear that Pythagoras was believed to hold that animals possessed a soul. As attributed in Ovid’s writings, “Animals share with us the privilege of having a soul,” a sentiment associated with Pythagorean teaching and vegetarian practice.

The Greek philosopher Empedocles, himself influenced by Pythagorean thought, later expanded these ideas by arguing that all living beings share kinship. He condemned the killing of animals and viewed both violence toward them and their consumption as morally corrupting. He even described animal sacrifice as a form of injustice, regardless of its religious purpose. Tradition holds that he once crafted an ox out of barley meal and perfumes as an offering to the gods in place of a real animal. Such ideas were radical in a society where animal sacrifice remained central to religious life, yet they demonstrate that compassion toward animals already held a respected place in Greek philosophical thought.

Plutarch: the first animal rights advocate

No ancient writer expressed these ideas more forcefully than the biographer Plutarch. Living during the 1st and early 2nd centuries AD, Plutarch wrote essays that challenged widely held assumptions about human superiority. In works such as “On the Eating of Flesh and Whether Land Animals Are Cleverer Than Sea Animals,” he argued that animals possessed intelligence, emotion, and reasoning ability.

Plutarch was troubled not only by cruelty toward animals itself but also by the indifference people showed toward suffering. One of his most cited passages asks readers to confront the moral shock of eating flesh: “I for my part do much admire in what humor, with what soul or reason, the first man with his mouth touched slaughter.”

This was not merely a dietary critique. Plutarch believed that violence toward animals corroded human morality. In his view, cruelty was a habit that extended outward. Societies accustomed to bloodshed against animals risked becoming desensitized to violence more broadly.He also rejected the idea that animals lacked intelligence. Plutarch insisted that animals possessed perception, memory, emotion, and understanding. In one striking passage, he describes them as beings capable of thought and awareness: “Each animal hath received from Nature…imagination, and intellection.”

For Plutarch, this recognition carried clear ethical implications. He criticized those who treated living creatures as mere objects of pleasure or luxury. In another memorable line, he writes: “But for the sake of some little mouthful of flesh, we deprive a soul of the sun and light.” Such language is striking because it attributes something close to personhood to animals. Plutarch ultimately presents them not as mindless beings but as fellow participants in the shared experience of life itself.

Ancient Greek philosopher Aristotle finds similarities between behavior of humans and animals

Other Ancient Greek thinkers also recognized forms of intelligence in animals. Aristotle, though less compassionate than Plutarch, studied animals extensively and acknowledged notable similarities between animal and human behavior. In his biological works, he observed memory, communication, and social organization across a wide range of species. Theophrastus, Aristotle’s successor, went even further, arguing that animals could reason and experience pain in ways comparable to humans. He opposed unnecessary slaughter, maintaining that humans and animals share a natural kinship.

Respect for animals in the Ancient Greek world also appeared in religious practice. Certain animals were considered sacred to specific gods, and in some sanctuaries, their killing was forbidden. Festivals at times honored animals alongside deities, while myths frequently portrayed them as wise guides, loyal companions, or messengers of divine will.

Yet the Greek attitude toward animals was never entirely uniform. The same society that mourned pets and admired dolphins also engaged in hunting and animal sacrifice. Oxen plowed fields, horses served in warfare, and livestock provided food. Ancient Greek culture therefore contained an ongoing tension between the practical use of animals and a genuine admiration for them.

This contradiction is what makes Plutarch particularly significant. Rather than accepting cruelty as inevitable, he challenged prevailing norms directly. He questioned whether intelligence, emotion, and the capacity to suffer should carry moral weight. In many ways, his writings anticipate modern discussions of animal consciousness and ethical responsibility.

Plutarch’s insistence that animals possess intelligence and feeling ultimately challenged assumptions of human superiority. He argued that kindness toward animals was inseparable from human virtue itself. To harm innocent creatures unnecessarily was, in his view, to diminish one’s own humanity.