Areus I (Ἄρειος Α') (d.265 BC) was Agiad King of Sparta from 309 to 265 BC, who died in battle near Corinth during the Chremonidean War.
In 272 BC Areus I successfully repelled Pyrrhus of Epirus from Laconia. In 272 BC Pyrrhus of Epirus with 25,000 foot soldiers, 2,000 cavalry, and 24 elephants marched into Laconia on the false pretense of "set[ting] free the cities which were subject to Antigonus" and "to send his younger sons to Sparta, if nothing prevented, to be brought up in the Lacedaemonian customs". While Areus was in Crete to support Gortys in its war against Knossos, Pyrrhus set siege to Sparta. The men and women of Sparta dug a trench around the city for defenses. After a day of fighting, the Spartans had held off Pyrrhus. By the end of the second day of fighting, Areus returned from Crete with 2,000 soldiers and aid from Corinth arrived.
Areus in the Maccabees
" Areus king of the Lacedemonians to Onias the high priest, greeting: It is found in writing, that the Lacedemonians and Jews are brethren, and that they are of the stock of Abraham:Now therefore, since this is come to our knowledge, ye shall do well to write unto us of your prosperity.We do write back again to you, that your cattle and goods are our's, and our's are your's. "
(Authorized King James Version 1.12.20) Three letters in the first book constitute the Jewish appeal of a Spartan affiliation. They are reproduced in a variant form by Josephus