Biography of Dhul Qarnayn

Dhul-Qarnayn:

Dhul-Qarnayn was the great king in history. Dhul-Qarnayn literately means "the possessor of the two horns".

There is not any historical identification about dhul qarnayn but it is said in chapter 18 surah kahaf that he traveled to the east and west.
The Quran narrates the story of how Allah establishes Dhul Qarnayn as a powerful ruler on earth and allows the king the freedom to do with his subjects as he please.

Reason of Revelation:

The disbelievers of Makkah sent word to the People of the Book and asked them for some information with which they could test the Prophet . They (the People of the Book) said, Ask him about a man who traveled extensively throughout the earth??? and about some young men who nobody knows what they did??? and about the Ruh (the soul)???. then Surat Al-Kahf was revealed. Dhul-Qarnayn had great Power.

Powers given by Allah:

Allah has given him great power,so that he had all that kings could have of might, armies, war equipment and siege machinery. So he had dominion over the east and the west, all countries and their kings submitted to him, and all the nations, Arab and non-Arab, served him. Some of them said he was called Dhul-Qarnayn (the one with two horns) because he reached the two "Horns" of the sun, east and west, where it rises and where it sets.

Story of Dhul qarnayn from Qur'an:

And they ask you, (O Muhammad), about Dhul-Qarnayn. Say, "I will recite to you about him a report."
Indeed We established him upon the earth, and We gave him to everything a way.So he followed a way.Until, when he reached the setting of the sun, he found it setting in a spring of dark mud, and he found near it a people. Allah said,

"O Dhul-Qarnayn, either you punish (them) or else adopt among them (a way of) goodness."

He said, "As for one who wrongs, we will punish him. Then he will be returned to his Lord, and He will punish him with a terrible punishment.
But as for one who believes and does righteousness, he will have a reward of Paradise, and we will speak to him from our command with ease."
Then he followed a way
Until, when he came to the rising of the sun, he found it rising on a people for whom We had not made against it any shield.
Thus. And We had encompassed (all) that he had in knowledge.
Until, when he reached (a pass) between two mountains, he found beside them a people who could hardly understand (his) speech.

They said, "O Dhul-Qarnayn, indeed Gog and Magog are (great) corrupter in the land.So may we assign for you an expenditure that you might make between us and them a barrier?"

He said, "That in which my Lord has established me is better (than what you offer), but assist me with strength; I will make between you and them a dam.

Bring me sheets of iron" - until, when he had leveled (them) between the two mountain walls, he said,"Blow (with bellows)," until when he had made it (like) fire, he said, "Bring me, that I may pour over it molten copper."
So Gog and Magog were unable to pass over it, nor were they able (to effect)in it any penetration.
(Dhul-Qarnayn) said, "This is a mercy from my Lord; but when the promise of my Lord comes, He will make it level, and ever is the promise of my Lord true."
(Al Qur'an, surah kahaf, verses 83-98)