Khosrow before the Walls of Gangdezh

From C4.37, Kay Khosrow Reaches Gangdezh. It illustrates C4.37.4–12:

C4.37.4
When Khosrow saw the walls of Gangdezh rise,A veil of tears fell down before his eyes.
C4.37.5
He left his steed and laid his head to ground,And praised the Maker with a respectful sound:
C4.37.6
“O righteous Judge, I am Your slave in awe,My heart is filled with reverence for Your law.
C4.37.7
You gave me strength and rule, with farr beside,An army, fortune, courage as my guide,
C4.37.8
That I might see my father’s city wall,Its towers lifted high above us all.
C4.37.9
It was Siavash who built this mighty place,By God’s own farr, raised from its lowest base.
C4.37.10
The tyrant’s hand that took his life awayLeft every heart in grief and deep dismay.”
C4.37.11
The troops together wept beside the wall,For blameless Siavash and for his fall.
C4.37.12
He perished by his adversary’s hand,A deed that sowed long feud through every land.