Periander was the second tyrant of the Cypselid dynasty that ruled over ancient Corinth. Periander's rule brought about a prosperous time in Corinth's history, as his administrative skill made Corinth one of the wealthiest city states in Greece. Several accounts state that Periander was a cruel and harsh ruler, but others claim that he was a fair and just king who worked to ensure that the distribution of wealth in Corinth was more or less even. He is often considered one of the Seven Sages of Greece, men of the 6th century BC who were renowned for centuries for their wisdom.

Diogenes Laërtius was a biographer of the Greek philosophers. Little is definitively known about his life, but his surviving Lives and Opinions of Eminent Philosophers is a principal source for the history of ancient Greek philosophy. His reputation is controversial among scholars because he often repeats information from his sources without critically evaluating it. He also frequently focuses on trivial or insignificant details of his subjects' lives while ignoring important details of their philosophical teachings and he sometimes fails to distinguish between earlier and later teachings of specific philosophical schools. However, unlike many other ancient secondary sources, Diogenes Laërtius generally reports philosophical teachings without attempting to reinterpret or expand on them, which means his accounts are often closer to the primary sources. Due to the loss of so many of the primary sources on which Diogenes relied, his work has become the foremost surviving source on the history of Greek philosophy.