The King-Slayer Before Bijan

From E10.14, The Death of Mahwi of Sur. It illustrates E10.14.16–26:

E10.14.16
The news reached Bijan: “Mahwi has been caught,That slave whose deeds such misery have brought.”
E10.14.17
The king-slayer, bound fast in iron chain,Was dragged in shame behind the warrior train.
E10.14.18
When Bijan heard, he laughed in his delight,Released from care, his heart once more grew light.
E10.14.19
They pitched a royal tent upon the sand,And dragged the traitor to his lord’s command.
E10.14.20
The guilty wretch saw Bijan standing near;His wits forsook him in his sudden fear.
E10.14.21
In dread he scattered sand upon his head,As one already numbered with the dead.
E10.14.22
Then Bijan said, “May no man ever ownA slave whose heart such wickedness has known.
E10.14.23
Why did you slay that righteous Shah, whose handHeld victory, throne, and crown by just command?
E10.14.24
A king by ancestry, a Shah by right,Anooshirvan’s memory and Iran’s light?”
E10.14.25
Mahwi replied, “For one whose deeds are base,Death and reproach are fitting, with disgrace.
E10.14.26
Now strike my neck, and let my guilt be paid;Before the gathered ranks my head be laid.”