We don't know. The best estimate includes the Spartans lost about 2,300 and the Thespians 1,400 in their last ditch stand to let the other Greek contingents escape. There were other Greek losses.
The Persians lost about 20,000.
There were about 300 Spartan hoplites plus about 2,000 of their Helots (serfs) who were used as light infantry - using javelins, bows, rocks etc
There were also many other city-states fighting with them, in total, there were 7,000 Greeks
On the third day, when the naval battles aimed at destroying the Persian fleet had failed and the purpose of holding the pass was thus gone, the Spartans sent off the other contingents (except the Thesbians whom they suspected of treachery) to take refuge inside the walls of friendly and fought the final battle to cover their withdrawal with the survivors of their 2,300 men.
About 20,000 according to Herodotus.
Another Comment:
Although, Herodotus also estimated that there were 2,600,000 Persians that were deployed to the battle whereas Ctesias estimates the number to be around 800,000. Now, modern estimates stand around 70,000 - 300,000 Persians Deployed.
If you take that into consideration the modern estimates of Persian Deaths could be anywhere around 1,000 - 3,000 in relation to the number of persians deployed.
Response:
The two figures of size and deaths are not inter-related.
Herodotos' figures are his description of the whole military levy of the Persian Empite - stretching from Libya to Central Asia. Xerxes was obviously not going to drag the knife men from Ethiopia (and all the other quaint warrios from elsewhere) to all the way up to Asia Minor, then down througn northern Greece, and have to feed them, to face Greek armoured infantry. Xerxes could afford to take only the pick of the crop - the very best infantry and cavalry.
There are many more realistic and unrealistic assessments and guesses, ancient and modern. The best approach is to look at the Persian commanders and command structure which Herodotos gives, and this points to three corps, each of five infantry and one cavalry division (division = myriad = 10,000). So we get 180,000.
It is not necessary to then divide Herodotos' deaths at Thermopylai by this propoportionate drop, as he is here dealing with an actual event, not a theoretical order of battle. The 20,000 is believable given the intensity and desperation of fighting in the confined pass over three days, and adding in the casualties of the simultaneous three-day sea battle in the neaby strait at Artemesion (which was the purpose of holding the pass - to force the sea battle and destroy the threat of the Persian fleet to the Greek cities and so allow them to send out their armies to join up for the later land battle at Plataia).
Incidentally, we get similar problems on the size of the Persian fleet - touted as 1,200. To get down to reality the authors create storms etc , to whittle it down to its more probable level of a starting 600, and after losses, more like 400 actually involved at Artemesion, and even fewer at Salamis when the absent Egyptian component is deducted. Then again, perhaps the missing 600 were the supply ships necessary to sustain the army from Asia Minor in such a poor country as Greece.
The main historian Herodotos doesn't say anything other than 'many'. This may mean a few thousand, more or less.
About 3,000.
About all 2,300 of them.
battle of thermopylae
No. The Spartans defeated about 500,000 Persians along with about 1,700 Greeks. Later on in the war, they withdrew to defend Sparta and lost the war. The Spartans alone did not fight or defeat Persians and Persian allies. Many Greek city states allied and defeated Persians in land and sea battles in two separate wars. The only Greek defeat from the most famous battles in the two separate Persian invasions was in Thermopylae. And even then, few thousand Greeks died, including plus or minus 300 Spartans, while it is believed more than 20,000 Persians and their allies that included many Greeks, died in Thermopylae. So it was an honorable defeat.
About half a million.
There were two sides. An assembled team of Greek states and the Persians. The Greek states were heavily outnumbered, due to the size of the Persian army and the fact that many Greek states didn't send any armies. The Greeks beat the Persians in the naval battle, forcing them to go through the narrow pass guarded by the states' armies. The armies stood at the pass blocking the Persians. The Persians failed to destroy the blocking army. Eventually a local citizen showed the Persians a path through the mountains. The leader of the army King Leonidas decided to send the bulk of the army away and keep about 1100 men to keep blocking the pass. These men were annihilated, but it was a Pyrrihic victory for the Persians, as they lost more men then they killed. The Persians were later defeated by the Greeks a year after the battle
No. The monument on which their names were supposedly inscribed is lost to time. Few we know of from Herodotus are Leonidas son of Anaxandridas II, Dienekes, Alpheios and Maron sons of Orsiphantos, Eurystos,and Aristodemos who is supposedly the only Spartan hoplite(not helot/slave,many of them survived) who survived the battle of Thermopylae.
about 20,000 Persians and 4000 Greeks.
20,000.
It is estimated that there were three-hundred Spartan Hoplites who died in the defense of the pass at Thermopylae .
around 6000
The pass of Thermopylae was used by peoples for thousands of years as a route between northern and southern Greece, first by nomadic peoples, then for trade and invasion. This led the Persians to use it as their route into southern Greece when they invaded in 480 BCE.
battle of thermopylae
One , notably Ephialtes .
It was 480 BCE.
No. The Spartans defeated about 500,000 Persians along with about 1,700 Greeks. Later on in the war, they withdrew to defend Sparta and lost the war. The Spartans alone did not fight or defeat Persians and Persian allies. Many Greek city states allied and defeated Persians in land and sea battles in two separate wars. The only Greek defeat from the most famous battles in the two separate Persian invasions was in Thermopylae. And even then, few thousand Greeks died, including plus or minus 300 Spartans, while it is believed more than 20,000 Persians and their allies that included many Greeks, died in Thermopylae. So it was an honorable defeat.
Because it would have been just stupid to hold the Battle of Thermopylae in, say, London.The Battle of Thermopylae (like many battles) was named for the place in which the battle took places. "Thermo" means "Hot" and "Pylae" means "Gates". The area was called the "Hot Gates" because the sharp cliff faces made passage very thin, like the imagined entrance into the fires of hell.The main Persian advantage over the Greeks was sheer numbers, which meant that the best chance for the Greeks to prevail was to force the Persians into a position where they could not outflank the Greeks and make the amount of fighters on each side more balanced. Because of how thin the passage was through Thermopylae, it was deemed as an excellent site to provide this type of position.
about 150,000
About 25,000.