“Then the conspirators

Came to the king.

They said to him.

‘Know!

O king!

That it is a law

Of the Medes,

Of the Persians,

That no interdict

Or ordinance

That the king establishes

Can be changed.’”

The Babylonian conspirators went to the king. They insisted that according to the law of Medes and Persia, no interdict or ordinance could be changed, once it was established. This is somewhat reminiscent of Esther, chapters 3-4, about the law against the Jews unable to be changed.