The similarity between Dhul-Qarnayn and late antique Alexander stories is a serious question, but it is not the knockdown argument it is often made to be. It shows a shared world of stories; it does not prove that the Quran copied a Syriac legend or canonized pagan Alexander as a prophet-like hero.
The argument at its strongest
The objection says: the Quran speaks of Dhul-Qarnayn as someone people were already asking about, and late antique Christians told stories about Alexander reaching the ends of the earth and building a barrier against savage nations. Alexander was also depicted with ram horns, so "Dhul-Qarnayn" - "the two-horned one" - seems to fit him. If the Quran is retelling that story, then, the critic says, it has mistaken legendary Christian romance for divine history.
They ask you about Dhul-Qarnayn. Say, "I will recite to you a mention of him."
Quran 18:83
That is the strongest form of the doubt. It should not be dismissed with mockery. The parallels are real enough to require thought.
What the Quran actually commits us to
The Quran never says "Alexander." It never calls Dhul-Qarnayn a Greek, a Macedonian, the son of Philip, a student of Aristotle, or a pagan conqueror. It gives a moral account of a ruler whom Allah empowered, who judged with justice, helped an oppressed people, and attributed his success to his Lord.
He said, "This is a mercy from my Lord. But when the promise of my Lord comes, He will make it level, and the promise of my Lord is true."
Quran 18:98
That matters. The Quran's claim is not, "The popular Alexander romance is true." Its claim is, "Here is a true reminder about Dhul-Qarnayn." If later Muslims, or some earlier listeners, connected him with Alexander, that identification is not part of the Quranic text.
Classical scholars did discuss the Alexander identification. Some accepted it because the name became widespread in historical lore. Others objected precisely because the famous Alexander was linked with pagan beliefs and with Aristotle. So the tradition itself did not require Muslims to equate Dhul-Qarnayn with the historical Alexander of Macedon.
Parallels do not settle direction or dependence
The Syriac Alexander Legend is usually placed in the late antique world, around the same broad period as the Quran, and its exact dating and relationship to earlier oral material are debated. Even if a Syriac form existed before the revelation, that would still not prove that Prophet Muhammad (PBUH) copied it. Stories move orally, motifs move between communities, and different texts can draw on a shared older memory.
Also, the differences are not small. The Quran is strikingly restrained. It removes Alexander's name, genealogy, mythology, pagan elements, political propaganda, and dramatic Christian imperial coloring. The Quranic passage is not interested in glorifying empire. It is about power under God, moral responsibility, and the limits of human achievement.
The horned image also proves less than claimed. Horns were a known symbol of royal strength in the ancient world, and Alexander did receive horned iconography. But an epithet fitting Alexander iconography does not prove the Quran means that Alexander, especially when the Quran avoids the name and gives a different religious portrait.
What this doubt does and does not establish
It does establish that the Dhul-Qarnayn passage speaks into a world where stories of great world-rulers, the edges of the earth, and a northern barrier were known. That is not embarrassing. The Quran often answers real questions in the language and concerns of its first audience.
It does not establish that the Quran is dependent on the Syriac Alexander Legend. It does not establish that Dhul-Qarnayn is certainly Alexander. It does not establish that Allah "canonized" a pagan as righteous. At most, it raises a historical possibility: that the Quran is engaging a known cycle of material. The Muslim answer is that revelation can correct, purify, and redirect what people already discuss.
So the fair reading is modest: there are parallels, but the Quran is not a repackaged romance. It gives a sober, theological account whose central lesson is that even the greatest worldly power is a mercy, a trust, and finally subject to the promise of Allah.