I understand there are different opinions about who Dhu al-Qarnayn is, and what the name really means:
وَيَسْأَلُونَكَ عَن ذِي الْقَرْنَيْنِ ۖ قُلْ سَأَتْلُو عَلَيْكُم مِّنْهُ ذِكْرًا
And they ask you, [O Muhammad], about Dhul-Qarnayn. Say, "I will recite to you about him a report."
Who is Dhul-Qarnayn?
Points to think about when answering:
- The people who asked about Dhul-Qarnayn and their relationship to him (I. e yasalonaka..)
- The description given about the events in 18:83 - 18:98 (i.e power, bulding barrier, travel from east to west and so on)
- If he was a king, Prophet or a ruler.
- If he was a "muslim" (or believer).
Whatever sources are needed to answer the question "who is dhul-qarnayn" is accepted, Islamic sources are of course preferable while identifying him with a historical person mentioned by Israelite legends or other legends are of course okay. All sources and theories should be well referenced and should met the points mentioned above. If you want to add counter arguments why Dhul-Qarynayn cannot be X, that would be a bonus. Analytical and structured answers are always preferable.