and sometimes they called them Persians.

有时就称他们为波斯人
It really doesn't matter because,

这其实无所谓
although the Medes took the lead in forming a national kingdom

虽然米堤亚人领导统一了各部落
out of a tribal society

形成了统一的王国
and were the first to be the dominant family

并在人们于伊朗高原扎定居后
on the Iranian plateau where these people finally settled down,

成为了当地第一个占统治地位的家族
the Persians then overthrew them

他们却在之后被波斯人推翻
and established themselves as the ruling group

波斯人建立了自己的政权
in that family under Cyrus the Great,

由居鲁士大帝家族统治
as he was called back

而他在约公元前559年时
probably in 559.

就被称为居鲁士大帝了
He was called Cyrus the Great,

之所以称他为居鲁士大帝