Why would absolute monarchs claim divine right to rule

The absolutist monarchs claimed divine right to rule because, by basing their power on a divine mandate, the people could not contradict them or face them, since as being a divine disposition it was something unquestionable.

The divine right of kings meant that the authority of a king to rule came from the will of the deity of the people he governs, and not from any temporal authority, not even from the will of his subjects or from any testament. Chosen by his deity, a monarch was only responsible before him, and he had only to answer for his actions before God. The doctrine implied that the deposition of the king or the restriction of power and prerogatives of the crown were acts contrary to the will of God.

a 3 branch government