The term due process means "fair treatment through the normal judicial system, especially as a citizen's entitlement" (<em>Oxford Languages</em>).
In other words, it means having a fair and regular process for all citizen's rights. The word entitlement means to have a right of/to something.
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He might have done it to save his people and so that they could fight back after his death and send the people that he sent home during the war to defeat the Persians after his death.
