243 BC

Millennium:	1st millennium BC
Centuries:	4th century BC – 3rd century BC – 2nd century BC
Decades:	270s BC 260s BC 250s BC – 240s BC – 230s BC 220s BC 210s BC
Years:	246 BC 245 BC 244 BC – 243 BC – 242 BC 241 BC 240 BC

243 BC by topic
Politics
State leaders – Sovereign states
Birth and death categories
Births – Deaths
Establishments and disestablishments categories
Establishments – Disestablishments

**243 BC in other calendars**
Gregorian calendar	243 BC
Ab urbe condita	511
Armenian calendar	N/A
Bahá'í calendar	-2086 – -2085
Bengali calendar	-835
Berber calendar	708
Buddhist calendar	302
Burmese calendar	-880
Byzantine calendar	5266 – 5267
Chinese calendar	[[Sexagenary cycle\|]]年 (2394/2454) — to — [[Sexagenary cycle\|]]年 (2395/2455)
Coptic calendar	-526 – -525
Ethiopian calendar	-250 – -249
Hebrew calendar	3518 – 3519
Hindu calendars
- Bikram Samwat	-186 – -185
- Shaka Samvat	N/A
- Kali Yuga	2859 – 2860
Holocene calendar	9758
Iranian calendar	864 BP – 863 BP
Islamic calendar	891 BH – 890 BH
Japanese calendar
Korean calendar	2091
Thai solar calendar	301

Events

Ptolemy III returns from Syria by a revolt in Egypt. As a result, Seleucus II is able to regain control of his kingdom with the Egyptians being pushed out of Mesopotamia and part of Northern Syria.
Ptolemy III returns from his conquests of Seleucid territory with a large amount of treasure and works of art, including many statues of Egyptian gods carried off to Persia by Cambyses. He restores the statues to the Egyptian temples and earns the title of Euergetes ("Benefactor").

Without a declaration of hostilities, Greek statesman, Aratus of Sicyon, who has gradually built up the Achaean League into a major power in Greece, makes a surprise attack on Corinth and forces the withdrawal of the Macedonian occupation troops. Megara, Troezen, and Epidaurus also desert the Macedonian King Antigonus II.
Drawing upon the tradition of the Spartan lawgiver, Lycurgus, the young Eurypontid king of Sparta, Agis IV, seeks to reform a system that distributes the land and wealth unequally and burden the poor with debt. He proposes the cancellation of debts and the division of the Spartan homeland into separate lots for each of its citizens. Full citizenship is to be extended to many perioeci (voteless freemen) and foreigners. In addition to pursuing these reforms, Agis seeks the restoration of the Lycurgan system of military training. Agis is supported by his wealthy mother and grandmother (who surrender their property), by his uncle Agesilaus, and by Lysander, who is an ephor (magistrate with the duty of limiting the power of the king).