Story of Khosrow Parviz, the King of Iran (Persia) [Miracle of Prophet Mohammad's (saw) prayer]

Of the kings to whom Prophet Mohammad (saw) had sent letters inviting them to Islam, one was Khosrow Parviz, the King of Iran (Persia). The letter was sent to him through Abdullah ibn Hudhafah.
In the Name of Allah, the Merciful, the Compassionate.
From Muhammad, Allah's Messenger, to Khosrow, the King of Persia. Greetings to the followers of the right path, to those obedient to Allah and His Prophet, to those who bear witness to Allah's Oneness, who worship the One God, and who bear witness to the prophecy of Allah's servant, Muhammad.
Truly I call upon you to obey Allah's command and convert to Islam. I am Allah's Messenger to all the people so that living hearts will be awakened and illuminated and so that infidels will have no excuses. Submit to Islam so you will be safe and immune, and if you disobey me and turn down my invitation, you will be blamed for the sins of the magi.
On receiving the letter, Khosrow Parviz ordered it to be translated. When it was translated, he noticed that the Prophet Mohammad (saw) had written his own name before king's and this proved too hard for him to digest. He tore the letter in fury, totally ignored Abdullah ibn Hudhafah and refrained from responding to the letter.
When Prophet Mohammad (saw) was informed of this act, he prayed: "O' Lord! You too tear apart his kingdom."
Khosrow Parviz wrote to Badhan, who was governor of Yemen, a Persian province: "It has reached my ears that a person has claimed Prophethood in Hijaz. Arrange to send two brave and courageous persons to him so that they may bring him to me as a captive."
Immediately Badhan sent Abadhaweih, one of his assistants, and a Persian officer called Kharkharah, with a warrant that required Prophet Mohammad (saw) to surrender himself to them and go with them to Khosrow Parviz. Badhan, however, asked his assistant to find out the truth about Prophet Mohammad (saw).
Abadhaweih and his companion traveled from Yemen until they arrived in Taif, which is about 90 km from Makkah. Its people told them that Prophet Mohammad (saw) was now in Madinah. The Taif people - who were not Muslims at the time and the Quraish were very pleased when they learned that the Persian emperor had ordered the arrest of Muhammad. They felt that Prophet Mohammad (saw) was now facing his most difficult test.
Clean-shaven but with large moustaches, the two officers from Yemen came to Prophet Mohammad (saw) in Madinah. Abadhaweih said to him: "Khosrow Parviz, the king of kings, has written to Badhan, the governor of Yemen, commanding him to send us to take you to him. If you comply, Badhan will write to the king of kings interceding on your behalf. This will spare you a great deal of trouble. If you reject his order, you know how powerful he is. He is sure to destroy you and your people as well as your country."
Prophet Mohammad (saw) did not like their appearance. He (saw) asked them who ordered them to shave their beards and their reply was: "Our Lord", meaning Khosrow Parviz. Prophet Mohammad (saw) said: "But my Lord has commanded me to wear a beard and to trim my moustache." He also asked them to wait till the following day when he was to meet them again. In the meantime, Prophet Mohammad (saw) received information through the angel Gabriel (Jabra'il) that Allah (SWT) had caused Khosrow Parviz to be killed by Shirweih, his own son, giving him the exact time of night and the date when Khosrow Parviz was killed in Persia.
Prophet Mohammad (saw) called in the Persian messengers and told them of the killing of their King. They said to him: "Do you realize what you are saying? Your arrest has been ordered for something much more trivial than this. Do you still wish us to write this down and inform governor Badhan of what you have just said?"
Prophet Mohammad (saw) replied: "Yes. Tell him also on my behalf that my religion and my kingdom will replace that of Khosrow Parviz and will sweep all before it. Tell him also that if he accepts Islam, I will give him what he has now under his authority and will make him a ruler in the area he now governs." Prophet Mohammad (saw) also gave Kharkharah a sack of gold and silver that was sent to him as a present by another king.
The two envoys left and went back to Yemen where they told Badhan of what Prophet Mohammad (saw) had said. He told them: "This is not the sort of thing a king would say. To my mind, the man is a prophet, as he claims. If he is, what he has just told you will come to pass. If it is true that Khosrow Parviz has been killed, the man is a prophet and a messenger. If not, we will make up our mind about what to do with him."
Presently Badhan received a message from Shirweih informing him that he had killed his father, Khosrow Parviz after he had adopted despotic measures against the Persian nobility. He also commanded him to ask his commanders to swear allegiance to him as the new King. He further asked him not to disturb Prophet Mohammad (saw) until he had received further instructions.
Badhan then realized that Muhammad was truly God's Messenger. He called Abadhaweih in and questioned him further about Prophet Mohammad (saw). The latter told him that Prophet Mohammad (saw) did not keep any guard to protect him from his people or from anyone else. "Nevertheless, I have never spoken to a man who has inspired me with awe as much as he does." Badhan was then certain that Muhammad was truly the Messenger of God and he communicated his conviction to his advisers and counselors. He declared that he wished to become a Muslim and they all joined him in accepting the message of the Prophet Mohammad (saw).This was the beginning of the spread of Islam in Yemen. The majority of its population, Christians and Magians alike, started to accept Islam. They conveyed this to Prophet Mohammad (saw) and he sent them some of his companions to teach them the principles of Islam and instruct them in how to lead an Islamic life.