<P> Coordinates: 38 ° 47 ′ 47.8" N 22 ° 32 ′ 12.2" E ﻿ / ﻿ 38.796611 ° N 22.536722 ° E ﻿ / 38.796611; 22.536722 </P> <Table> <Tr> <Td> <Table> <Tr> <Th_colspan="2"> Battle of Thermopylae </Th> </Tr> <Tr> <Td_colspan="2"> Part of the Greco - Persian Wars </Td> </Tr> <Tr> <Td_colspan="2"> The site of the battle today . Mount Kallidromon on the left, and the wide coastal plain formed by accretion of fluvial deposits over the centuries; the road to the right approximates the 480 BC shoreline . </Td> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Th> Date </Th> <Td> 20 August or 8--10 September, 480 BC </Td> </Tr> <Tr> <Th> Location </Th> <Td> Thermopylae, Greece 38 ° 47 ′ 48" N 22 ° 32 ′ 12" E ﻿ / ﻿ 38.796607 ° N 22.536714 ° E ﻿ / 38.796607; 22.536714 </Td> </Tr> <Tr> <Th> Result </Th> <Td> Persian victory </Td> </Tr> <Tr> <Th> Territorial changes </Th> <Td> Persians gain control of Boeotia </Td> </Tr> </Table> </Td> </Tr> <Tr> <Th_colspan="2"> Belligerents </Th> </Tr> <Tr> <Td> Greek city - states </Td> <Td> Persian Empire </Td> </Tr> <Tr> <Th_colspan="2"> Commanders and leaders </Th> </Tr> <Tr> <Td> King Leonidas I † Demophilus † </Td> <Td> King Xerxes I of Persia Mardonius Hydarnes II </Td> </Tr> <Tr> <Th_colspan="2"> Strength </Th> </Tr> <Tr> <Td> Total 5,200 (or 6100) (Herodotus) 7,400 + (Diodorus) 11,200 (Pausanias) 7,000 (modern est .) </Td> <Td> 2,124,000 (Herodotus) 120,000--300,000 (modern est .) </Td> </Tr> <Tr> <Th_colspan="2"> Casualties and losses </Th> </Tr> <Tr> <Td> 4,000 (Herodotus) </Td> <Td> ~ 20,000 (Herodotus) </Td> </Tr> <Tr> <Td_colspan="2"> Location of the battle of Thermopylae </Td> </Tr> </Table> </Td> </Tr> <Tr> <Td> <Table> <Tr> <Th_colspan="2"> (hide) <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> Second Persian invasion of Greece </Th> </Tr> <Tr> <Td_colspan="2"> <Ul> <Li> Thermopylae </Li> <Li> Artemisium </Li> <Li> Salamis </Li> <Li> Potidea </Li> <Li> Olynthus </Li> <Li> Plataea </Li> <Li> Mycale </Li> </Ul> </Td> </Tr> </Table> </Td> </Tr> </Table> <Tr> <Td> <Table> <Tr> <Th_colspan="2"> Battle of Thermopylae </Th> </Tr> <Tr> <Td_colspan="2"> Part of the Greco - Persian Wars </Td> </Tr> <Tr> <Td_colspan="2"> The site of the battle today . Mount Kallidromon on the left, and the wide coastal plain formed by accretion of fluvial deposits over the centuries; the road to the right approximates the 480 BC shoreline . </Td> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Th> Date </Th> <Td> 20 August or 8--10 September, 480 BC </Td> </Tr> <Tr> <Th> Location </Th> <Td> Thermopylae, Greece 38 ° 47 ′ 48" N 22 ° 32 ′ 12" E ﻿ / ﻿ 38.796607 ° N 22.536714 ° E ﻿ / 38.796607; 22.536714 </Td> </Tr> <Tr> <Th> Result </Th> <Td> Persian victory </Td> </Tr> <Tr> <Th> Territorial changes </Th> <Td> Persians gain control of Boeotia </Td> </Tr> </Table> </Td> </Tr> <Tr> <Th_colspan="2"> Belligerents </Th> </Tr> <Tr> <Td> Greek city - states </Td> <Td> Persian Empire </Td> </Tr> <Tr> <Th_colspan="2"> Commanders and leaders </Th> </Tr> <Tr> <Td> King Leonidas I † Demophilus † </Td> <Td> King Xerxes I of Persia Mardonius Hydarnes II </Td> </Tr> <Tr> <Th_colspan="2"> Strength </Th> </Tr> <Tr> <Td> Total 5,200 (or 6100) (Herodotus) 7,400 + (Diodorus) 11,200 (Pausanias) 7,000 (modern est .) </Td> <Td> 2,124,000 (Herodotus) 120,000--300,000 (modern est .) </Td> </Tr> <Tr> <Th_colspan="2"> Casualties and losses </Th> </Tr> <Tr> <Td> 4,000 (Herodotus) </Td> <Td> ~ 20,000 (Herodotus) </Td> </Tr> <Tr> <Td_colspan="2"> Location of the battle of Thermopylae </Td> </Tr> </Table> </Td> </Tr> <Table> <Tr> <Th_colspan="2"> Battle of Thermopylae </Th> </Tr> <Tr> <Td_colspan="2"> Part of the Greco - Persian Wars </Td> </Tr> <Tr> <Td_colspan="2"> The site of the battle today . Mount Kallidromon on the left, and the wide coastal plain formed by accretion of fluvial deposits over the centuries; the road to the right approximates the 480 BC shoreline . </Td> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Th> Date </Th> <Td> 20 August or 8--10 September, 480 BC </Td> </Tr> <Tr> <Th> Location </Th> <Td> Thermopylae, Greece 38 ° 47 ′ 48" N 22 ° 32 ′ 12" E ﻿ / ﻿ 38.796607 ° N 22.536714 ° E ﻿ / 38.796607; 22.536714 </Td> </Tr> <Tr> <Th> Result </Th> <Td> Persian victory </Td> </Tr> <Tr> <Th> Territorial changes </Th> <Td> Persians gain control of Boeotia </Td> </Tr> </Table> </Td> </Tr> <Tr> <Th_colspan="2"> Belligerents </Th> </Tr> <Tr> <Td> Greek city - states </Td> <Td> Persian Empire </Td> </Tr> <Tr> <Th_colspan="2"> Commanders and leaders </Th> </Tr> <Tr> <Td> King Leonidas I † Demophilus † </Td> <Td> King Xerxes I of Persia Mardonius Hydarnes II </Td> </Tr> <Tr> <Th_colspan="2"> Strength </Th> </Tr> <Tr> <Td> Total 5,200 (or 6100) (Herodotus) 7,400 + (Diodorus) 11,200 (Pausanias) 7,000 (modern est .) </Td> <Td> 2,124,000 (Herodotus) 120,000--300,000 (modern est .) </Td> </Tr> <Tr> <Th_colspan="2"> Casualties and losses </Th> </Tr> <Tr> <Td> 4,000 (Herodotus) </Td> <Td> ~ 20,000 (Herodotus) </Td> </Tr> <Tr> <Td_colspan="2"> Location of the battle of Thermopylae </Td> </Tr> </Table>

When did the battle of thermopylae take place