305 BC

305 BC in various calendars
Gregorian calendar	305 BC; CCCV BC
Ab urbe condita	449
Ancient Egypt era	XXXIII dynasty, 19
- Pharaoh	Ptolemy I Soter, 19
Ancient Greek era	118th Olympiad, year 4
Assyrian calendar	4446
Balinese saka calendar	N/A
Bengali calendar	−897
Berber calendar	646
Buddhist calendar	240
Burmese calendar	−942
Byzantine calendar	5204–5205
Chinese calendar	乙卯年 (Wood Rabbit); 2393 or 2186; — to —; 丙辰年 (Fire Dragon); 2394 or 2187
Coptic calendar	−588 – −587
Discordian calendar	862
Ethiopian calendar	−312 – −311
Hebrew calendar	3456–3457
Hindu calendars
- Vikram Samvat	−248 – −247
- Shaka Samvat	N/A
- Kali Yuga	2796–2797
Holocene calendar	9696
Iranian calendar	926 BP – 925 BP
Islamic calendar	954 BH – 953 BH
Javanese calendar	N/A
Julian calendar	N/A
Korean calendar	2029
Minguo calendar	2216 before ROC; 民前2216年
Nanakshahi calendar	−1772
Seleucid era	7/8 AG
Thai solar calendar	238–239
Tibetan calendar	阴木兔年; (female Wood-Rabbit); −178 or −559 or −1331; — to —; 阳火龙年; (male Fire-Dragon); −177 or −558 or −1330

250 BC in various calendars
Gregorian calendar	250 BC; CCL BC
Ab urbe condita	504
Ancient Egypt era	XXXIII dynasty, 74
- Pharaoh	Ptolemy II Philadelphus, 34
Ancient Greek era	132nd Olympiad, year 3
Assyrian calendar	4501
Balinese saka calendar	N/A
Bengali calendar	−842
Berber calendar	701
Buddhist calendar	295
Burmese calendar	−887
Byzantine calendar	5259–5260
Chinese calendar	庚戌年 (Metal Dog); 2448 or 2241; — to —; 辛亥年 (Metal Pig); 2449 or 2242
Coptic calendar	−533 – −532
Discordian calendar	917
Ethiopian calendar	−257 – −256
Hebrew calendar	3511–3512
Hindu calendars
- Vikram Samvat	−193 – −192
- Shaka Samvat	N/A
- Kali Yuga	2851–2852
Holocene calendar	9751
Iranian calendar	871 BP – 870 BP
Islamic calendar	898 BH – 897 BH
Javanese calendar	N/A
Julian calendar	N/A
Korean calendar	2084
Minguo calendar	2161 before ROC; 民前2161年
Nanakshahi calendar	−1717
Seleucid era	62/63 AG
Thai solar calendar	293–294
Tibetan calendar	阳金狗年; (male Iron-Dog); −123 or −504 or −1276; — to —; 阴金猪年; (female Iron-Pig); −122 or −503 or −1275

Events

Antigonus I Monophthalmus sends his son Demetrius to conquer Rhodes, which has refused him armed support against Ptolemy. He shows ingenuity in devising new siege engines in his unsuccessful attempt to reduce the city. Among his creations are a battering ram 60 metres long and requiring 1,000 men to operate it and a wheeled siege tower named "Helepolis" (or "Taker of Cities") which stands 40 metres tall and 20 metres wide and weighs 180 tons. This siege of Rhodes earns Demetrius the title Poliorcetes ("the City Besieger").

The Roman consuls, Marcus Fulvius Curvus Paetinus and Lucius Postumius Megellus, decisively defeat the Samnites in the Battle of Bovianum to end the Second Samnite War.