Answer from the text, when was fought the battle of Salamis?
Like the Battles of Marathon and Thermopylae, Salamis has gained something of a 'legendary' status (unlike, for instance, the more decisive Battle of Plataea), perhaps because of the desperate circumstances and the unlikely odds. A significant number of historians have stated that Salamis is one of the most significant battles in human history (though the same is often stated of Marathon). In a more extreme form of this argument, some historians argue that if the Greeks had lost at Salamis, the ensuing conquest of Greece by the Persians would have effectively stifled the growth of Western Civilization as we know it. This view is based on the premise that much of modern Western society, such as philosophy, science, personal freedom and democracy are rooted in the legacy of Ancient Greece. Thus, this school of thought argues that, given the domination of much of modern history by Western Civilization, Persian domination of Greece might have changed the whole trajectory of human history. It is also worth mentioning that the celebrated blossoming of hugely influential Athenian culture occurred only after the Persian wars were won.

From: https://en.wikipedia.org/wiki/Battle_of_Salamis
The battle was fought in 480 BC.