Pausanias II of Sparta in Wikipedia
Pausanias (Greek Παυσανίας) King of Sparta from 409 BC. He was in frequent conflict with the Ephors. Aristotle said that he tried to overthrow them. Army leader Lysander sent a letter to him, requesting help against Thebes, but it was intercepted. In 395, Pausanias failed to join forces with Lysander, and for this was condemned to death and replaced as king by his son Agesipolis I.
Pausanias escaped execution and left Sparta to live in exile in Tegea. He wrote his book in Tegea. No fragments of the book survived and its contents or purposes are very uncertain. He also traveled in the Persian Empire, and married a Persian princess.
Pausanias is one of the first three writers to make an appearance in Sparta apart from poets at the very start of the 4th century BC. Lysander was also one of these three writers. Scholars are certain that he and Pausanias knew each other and attempted to communicate via letters.