303 BC

Millennium:	1st millennium BC
Centuries:	5th century BC - 4th century BC - 3rd century BC
Decades:	330s BC 320s BC 310s BC - 300s BC - 290s BC 280s BC 270s BC
Years:	306 BC 305 BC 304 BC - 303 BC - 302 BC 301 BC 300 BC

303 BC by topic
Politics
State leaders - Sovereign states
Birth and death categories
Births - Deaths
Establishments and disestablishments categories
Establishments - Disestablishments v • d • e

**303 BC in other calendars**
Gregorian calendar	303 BC
Ab urbe condita	451
Armenian calendar	N/A
Bahá'í calendar	-2146 – -2145
Berber calendar	648
Buddhist calendar	242
Burmese calendar	-940
Byzantine calendar	5206 – 5207
Chinese calendar	[[Sexagenary cycle\|]]年 (2334/2394) — to — [[Sexagenary cycle\|]]年 (2335/2395)
Coptic calendar	-586 – -585
Ethiopian calendar	-310 – -309
Hebrew calendar	3458 – 3459
Hindu calendars
- Vikram Samvat	-247 – -246
- Shaka Samvat	N/A
- Kali Yuga	2799 – 2800
Holocene calendar	9698
Iranian calendar	924 BP – 923 BP
Islamic calendar	952 BH – 951 BH
Japanese calendar
Korean calendar	2031
Thai solar calendar	241
v • d • e

Events

Seleucus I Nicator expands his kingdom throughout Persia as far east as India, but his advance is eventually halted by Chandragupta Maurya, the founder of the Maurya dynasty of India. In a pact concluded by the two leaders, Seleucus agrees to territorial concessions in exchange for 500 war-trained elephants .
Seleucus refounds the town of Orrhoa in northern Mesopotamia as a military colony and mixes Greek settlers with its eastern population. He names Edessa in memory of the ancient capital of Macedon.

Cassander and Lysimachus persuade Seleucus and Ptolemy to join them in trying to destroy Antigonus.
Demetrius Poliorcetes occupies Corinth, Sicyon, and Argos in the Peloponnese, and Achaea, Elis and almost all of Arcadia join his side.

The citizens of Tarentum seek the help of the Spartan general, Cleonymus. He is able to pacify the Lucanians with the agreement of the Romans.

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