The year of the four emperors: Did you mean...?

This infographic illustrates the Varna caste system in ancient India. First mentioned in the Rig Veda's Purusha Sukta c. 1200–1000 BCE, it shows society divided into four groups that emerged from the sacrifice of Purusha, a transcendent and...

A painting of four monks by Claudio Rinaldi (1852-1909 CE). (Dorotheum, Munich)

Marble portrait heads of four Greek philosophers (Socrates, Antisthenes of Athens, Chrysippus, and Epicurus), Roman copies after Hellenistic originals. The British Museum, London.

A photograph of the 'Big Four' leaders at the Paris Peace Conference at Versailles which decided peace terms after the First World War (1914-18). Left to Right: Prime Minister of Italy Vittorio Orlando (1860-1952), Prime Minister of the United...

Porphyry sculpture portraying the four Tetrarchs (Diocletian, Maximianus, Galerius and Constantius Chlorus) embracing. It is dated to c. 300 CE and was sculpted in Asia Minor. It probably originally decorated two separate pillars in Constantinople...

Four Horsemen of the Apocalypse, oil on canvas painting by Viktor Vasnetsov, 1887. Glinka National Museum Consortium of Musical Culture, Moscow.

Eos in her four-horse chariot, detail of terracotta red-figure lekanis vase attributed to the Stuttgart group, from Canosa, late 300s BCE. Metropolitan Museum of Art, New York.

The Four Elements. Painting by Mana Lesman. Used with the permission of the artist.

Alabaster bas-relief of an Apkallu with four wings. Neo-Assyrian Period, 865-860 BCE. Panel 26, Room B, the North-West Palace at Nimrud, modern-day Iraq. (The British Museum, London)

Four tubes are connected to the upper and lower portions of these ancient Roman glass bottles. The tubes were created by carefully cutting and bending the body of a free-blown glass bottle. Like similar piece from Trier, the Cologne bottle...