The official inscriptions from Persia show him as continuing his father’s legacy by completing building projects. The Greek sources, such as Aeschylus, in his play Persians (472 BC) shows him as impulsive and aggressive (but remember, this is a work of fiction, so we need to be careful about inaccuracy and bias). Herodotus, writing a little afterwards, portrays him in a similar way. Is this because that is the way he was, or is it because they are both Greek (and Aeschylus had fought against the Persians at Marathon)?