Sitalces (Ancient Greek: Σιτάλκης, reigned 431-424 BC) was one of the great kings of the Thracian Odrysian state. He was the son of Teres, and on the sudden death of his father in 431 BC succeeded to the throne. Sitalces enlarged his kingdom by successful wars, and it soon comprised the whole territory from Abdera in the south to the mouths of the Danube in the north, and from Black Sea in the east to the sources of the Struma in the west.

At the commencement of the Peloponnesian war Sitalces entered into alliance with the Athenians, and in 429 BC he invaded Macedon (then ruled by Perdiccas II) with a vast army that included 150,000 warriors from independent Thracian tribes (such as the Dii) and Paeonian tribes (Agrianes, Laeaeans). He was obliged to retire through failure of provisions.

Sitalces was killed in 424 by the Thracian Triballi. He was succeeded on the Odrysian throne by Seuthes.

Sitalk Peak on Livingston Island in the South Shetland Islands, Antarctica is named for Sitalces.

Sitalces Odrysian kingdom of Thrace Born: Unknown Died: 424 BC
Preceded by Teres I	King of Thrace 431–424 BC	Succeeded by Seuthes I

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