Khosrow Bares the Royal Birthmark

From B10.17, Giv Finds Kay Khosrow. It illustrates B10.17.54–60:

B10.17.54
Then Giv replied: “O head of all the great,What sign confirms the farr that marks your state?
B10.17.55
Siavash bore a dark and royal sign,Like one black spot within a rose design.
B10.17.56
Reveal your arm and let me plainly seeThe sign that proves your noble pedigree.”
B10.17.57
The prince then bared his arm without delay,And showed the royal birthmark clear as day.
B10.17.58
A dark birthmark from Kay Qobad’s old line,A Kayanian token, clear in its design.
B10.17.59
When Giv beheld the sign, he bowed to earth;His tears proclaimed the truth of Khosrow’s birth.
B10.17.60
Giv clasped the Shah and blessed his royal name;And joy rose in his heart like sudden flame.