6th-century BC monarchs

king of Rome from 535 to 509 BC

legendary sixth king of Rome

legendary fifth King of Rome

King of Anshan in Iran from c. 580 to 559 BC and the father of Cyrus the Great

Agiad King of Sparta from c.524 BC to c.490 BC

thumb|Bronze Statue of Demaratus in the Naples Museo Archeologico Demaratus (Greek: Δημάρατος, Demaratos; Doric: Δαμάρατος, Damaratos) was a king of Sparta from around 515 BC to 491 BC. He was the 15th ruler of the Eurypontid dynasty and the firstborn son of King Ariston. During his reign, Demaratus is best known for his opposition to his co-ruler, King Cleomenes I of the Agiad dynasty. This rivalry ultimately led to his dethronement around 491 BC, following Cleomenes's accusations of illegitimacy and political maneuvering.

Gelon also known as Geto (Greek: Γέλων Gelon, gen.: Γέλωνος; died 478 BC), son of Deinomenes, was a Greek tyrant of the Sicilian cities Gela and Syracuse, Sicily, and first of the Deinomenid rulers.

late 6th century BC Etruscan king of Clusium

Agiad king of Sparta from c.560 to c.524 BC

legendary king of Sparta

Eurypontid king of Sparta from c.560 to c.510 BC

Eurycratides (, meaning "descendant of Eurycrates") was the thirteenth king of Sparta from the Agiad dynasty. He succeeded his father Anaxander around 615 BC and reigned during a devastating period of war with Tegea.

Magonid king of Carthage from 510 to 480 BC

Agasicles, alternatively spelled Agesicles or Hegesicles (), was a king of Sparta, the 13th of the line of Procles.

King of Carthage from 550 BC to 530 BC

early 6th-century BC king of Cyrenaica

6th-century BC king of Cyrenaica

Cyrenaean King from c.530 BC to c.515 BC

Magonid King of Carthage from 530 BC to 510 BC

king of Cyrenaica from 550 to 530 BC

5th-century Greek ruler of Epirus

Arganthonios () was a king of ancient Tartessos (in Andalusia, southern Spain) who according to Herodotus, was visited by Kolaios of Samos. Given the legendary status of Geryon, Gargoris and Habis, Arganthonios is the earliest documented monarch of the Iberian Peninsula.

Greek king of Cyrene from 515 BC to 465 BC

Idanthyrsus (; ) is the name of a Scythian king who lived in the 6th century BCE, when he faced an invasion of his country by the Persian Achaemenid Empire.

Scopasis ( ) was a 6th-century BC Scythian king of the Sauromatae tribe. The Greek historian Herodotus mentions him in his Histories, as he and the kings Taxakis and Idanthyrsus commanded the three divisions of the Scythian forces, when Scythia was invaded by Darius I of Persia in between 520 and 507 BC (most likely in 513 BC). It was the contingent under the command of Scopasis that arrived at the Istros (Danube) river before Darius could reach it during his retreat. Scopasis defeated Darius' Ionian allies to destroy the bridge of boats over the river and thus ensure the destruction and defea