|Millennium:||1st millennium BC|
|218 BC by topic|
|Gregorian calendar||218 BC|
|Ab urbe condita||536|
|Ancient Egypt era||XXXIII dynasty, 106|
|- Pharaoh||Ptolemy IV Philopator, 4|
|Ancient Greek era||140th Olympiad, year 3|
|Balinese saka calendar||N/A|
|Chinese calendar||壬午年 (Water Horse)|
2479 or 2419
— to —
癸未年 (Water Goat)
2480 or 2420
|Coptic calendar||−501 – −500|
|Ethiopian calendar||−225 – −224|
|- Vikram Samvat||−161 – −160|
|- Shaka Samvat||N/A|
|- Kali Yuga||2883–2884|
|Iranian calendar||839 BP – 838 BP|
|Islamic calendar||865 BH – 864 BH|
|Minguo calendar||2129 before ROC|
|Seleucid era||94/95 AG|
|Thai solar calendar||325–326|
−91 or −472 or −1244
— to —
−90 or −471 or −1243
Year 218 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Scipio and Longus (or, less frequently, year 536 Ab urbe condita). The denomination 218 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
- Fall of Saguntum to Hannibal of Carthage
- Hannibal sets out with around 40,000 men and 50 elephants from New Carthage (Cartagena) to northern Spain and then into the Pyrenees where his army meets with stiff resistance from the Pyrenean tribes. This opposition and the desertion of some of his Spanish troops greatly diminishes his numbers, but he reaches the river Rhône facing little resistance from the tribes of southern Gaul.
- Second Punic War
- The Roman Senate orders Sempronius Longus to travel from Sicily to reinforce Scipio's troops.
- December 18: Battle of the Trebia: Hannibal defeats the combined Roman armies under Sempronius and Scipio.
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