Pleistarchus (d.458 BC) was the Agiad King of Sparta from 480 to 458 BC. Pleistarchus was the son of Leonidas I and Gorgo. For the early part of his reign his cousin Pausanias, acted as regent because Pleistarchus was not of age, thus not able to rule. Centuries: 4th century BC - 5th century BC - 6th century BC Decades: 500s BC 490s BC 480s BC 470s BC 460s BC - 450s BC - 440s BC 430s BC 420s BC 410s BC 400s BC Years: 463 BC 462 BC 461 BC 460 BC 459 BC - 458 BC - 457 BC 456 BC... Sparta was an important Greek city-state in the Peloponnesus. ... Events King Xerxes I of Persia sets out to conquer Greece. ... Centuries: 4th century BC - 5th century BC - 6th century BC Decades: 500s BC 490s BC 480s BC 470s BC 460s BC - 450s BC - 440s BC 430s BC 420s BC 410s BC 400s BC Years: 463 BC 462 BC 461 BC 460 BC 459 BC - 458 BC - 457 BC 456 BC... Leonidas (Greek: - Lions son, Lion-like) was a king of Sparta, the 17th of the Agiad line, one of the sons of King Anaxandridas II of Sparta. ... Gorgo was the daughter and the only child of Cleomenes I, King of Sparta during the 6th and 5th centuries BC. She was the wife of her uncle, King Leonidas I who fought and died in the Battle of Thermopylae. ... Pausanias (Greek = Παυσανίας) was a Spartan general of the 5th century BCE. He was the nephew of Leonidas I and served as regent after his uncles death, as Leonidas son, Pleistarchus was still under-age. ...