The hero Rostam meets a young warrior in single combat, defeats and fatally stabs him, then discovers from an armband that the youth is Sohrab, his own son, who had been seeking his father. Rostam could have sent for a healing elixir from the king, but the king withholds it out of fear, and Sohrab dies.
Kingship is sanctioned by a transferable divine radiance (farr) that abandons a ruler the moment he acts unjustly or arrogantly, as when Jamshid claims godhood and loses his throne. Authority is therefore conditional on righteous conduct, not inherited status alone; the crown can pass away from a bloodline that forfeits it.
The usurper Zahhak lets the devil kiss his shoulders, from which spring two serpents that must be fed human brains daily, so his reign literally consumes his own people. Tyranny is figured as an appetite that can never be satisfied and that devours the subjects it depends on.
The poet frames the retelling of ancestral deeds as a monument that outlasts palaces and bodies, asserting that a people survives through the language and stories it preserves rather than through its buildings or conquests. Cultural memory, on this view, is the real substance of a nation, and the act of writing is itself a political preservation.