When Maryam, the Roman princess and wife of Khosrow Parviz, gave birth to a prince, immense joy filled the Sasanian court. King Khosrow immediately commanded a royal epistle to be penned to Caesar of Rome, bearing the glad tidings of his grandson's birth—a child of exquisite beauty and noble lineage, destined for wisdom, the throne, and majestic sovereign luck. Khosrow urged Caesar to join in this supreme jubilation, wishing him eternal crown and glory.
Upon receiving the letter marked with the royal seal of Parviz, Caesar was overwhelmed with delight. He commanded the war-horns and clarions to resound across Byzantium. Every city, from border to border, erupted into vibrant revelry. Musician songs echoed through the avenues, while the fragrance of roses and sweet perfume infused the air. For a full week, the realm of Rome celebrated with wine, melody, and sacred crosses, honoring the newborn prince Shiruy.
Thereafter, Caesar ordered a caravan of unparalleled splendor to be laden. One hundred camels carried heavy loads of silver dirhams, fifty carried minted gold dinars, two hundred robes of Roman gold-brocaded silk were packed, along with forty golden trays adorned with coral and jewels, and jeweled statues of silver and gold beasts. For Maryam, he sent rare gems, soft silks, and a magnificent peacock fashioned from pure solid gold. In addition, four terms of imperial tribute in millions of gold dinars were placed upon the caravan.
To escort these treasures, Caesar selected forty wise philosophers and noblemen, led by a revered champion and statesman named Khangi, whose wisdom had no equal. As word of the Byzantine embassy reached King Khosrow Parviz, he dispatched Farrokh, the illustrious marzban of Nimruz, accompanied by horsemen wearing golden helmets, to greet them with grand ceremony.
Upon entering the magnificent presence of Khosrow Parviz, Khangi and the Roman sages bowed low, pressing their faces to the dust, invoking blessings upon the King of Kings and praising the Divine Sovereign for his justice and glory. Khosrow received the embassy with immense warmth, hosting them in two majestic palaces and bestowing upon Khangi a seat of honor upon a golden throne.
The Shahanshah then turned to his famed scribe, Khorrad Barzin, bidding him to read Caesar's letter aloud before the assembled grandees and army. The letter opened with praise to Yazdan and honored the glorious heritage of Khosrow—tracing his imperial root from Kyumars, Hushang, and Tahmuras down to the immortal soul of Anushirvan. Caesar exalted the new bond of kinship between Rome and Iran, declaring that it brought joy like water to the thirsty. Finally, Caesar presented his central request: the return of the True Cross (Dar-e Masiha), preserved within the royal Sasanian treasury. Caesar pledged that with the restoration of this holy relic, Christian rites would shine anew, ancient hatreds tracing back to Fereydun, Salm, and Tur would be forever cleansed, and enduring peace would reign over both empires.