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Plato (l. 424/423 to 348/347 BCE) is the pre-eminent Greek philosopher, known for his Dialogues and for founding his Academy in Athens, traditionally considered the first university in the Western world. Plato was a student of Socrates and...

Plebeians were members of the plebs, the hereditary social class of commoners in ancient Rome. Their exclusion from political power by the patricians, who claimed to be the descendants of the first senators, led to Conflict of the Orders...

Pliny the Younger (61-112 CE) was the nephew of Pliny the Elder (23-79 CE), the author of the 37-volume Natural History. He had a remarkable political career and gained a reputation as an excellent lawyer and orator, but he is most famous...

The word 'plague', in defining a lethal epidemic, was coined by the physician Galen (l. 130-210 CE) who lived through the Antonine Plague (165 - c. 180/190 CE) but the disease was recorded long before in relating the affliction of the Plague...

Pluto is the god of the Underworld in Roman mythology. His Greek counterpart was Hades. Pluto chose never to sit on Olympus with the other gods and goddesses, preferring to remain in the Underworld. Family Pluto (Hades) was the son of...

The Plymouth Colony (1620-1691) was the first English settlement in the region of modern-day New England in the United States, settled by the religious Separatists known as the “pilgrims” who crossed the Atlantic Ocean on the Mayflower in...

The Plague of Cyprian erupted in Ethiopia around Easter of 250 CE. It reached Rome in the following year eventually spreading to Greece and further east to Syria. The plague lasted nearly 20 years and, at its height, reportedly killed as...

L. Mestrius Plutarchus, better known simply as Plutarch, was a Greek writer and philosopher who lived between c. 45-50 CE and c. 120-125 CE. A prodigious and hugely influential writer, he is now most famous for his biographical works in his...

The Plains Indians (also known as Native Americans of the Plains and Prairie, Indigenous Peoples of the Great Plains) are the original inhabitants of the western plains of North America, now part of the United States and Canada. They are...

Pliny the Younger's (61-112 CE) letter (Epistulae X.96) to Roman Emperor Trajan (r. 98-117 CE) is one of our earliest sources on Christianity from an outsider's point of view. It highlights the Christian movement's impact on the old Roman...