Who was the first King of Jerusalem mentioned in the Bible?

The first king about whom there is no question is "the King og Jerusalem" mentioned as one of 31 kings who were beaten in battle by the Israelites in Joshua 32. Some authorities think that Salem in Genesis was another name for Jerusalem, and their king was Malchitzedek. The name Jerusalem, however, is not mentioned even once in the Books of Moses (the Torah). King David was the first Israelite king whose capital was in Jerusalem.

Sorry, that "the King of Jerusalem" in Joshua 12.

Sorry, not far out but wrong answer, and I'm specifically referring to Jerusalem, not Salem, so Melchizedek is out. The king in question is named too.

Then it is definately the king of Jerusalem in Joshua. In fact, he even has a name, Anoditzedek (Joshua 10:1: And as Adonitzedek, King of Jerusalem, heard that Joshua had taken the city of Ai and razed it, as he had done to Jericho and their king, and that the people of Gibeon had made peace with Israel... They were very afraid...)

That's him - Joshua 10, verse 1: "Now it came to pass, when Adoni-zedec king of Jerusalem --------------".

He's stll mentioned in chapter 12: "The King of Jerusalem - one... All these kings are thirty one."

Ah, but my question was 'who was he', and you didn't give me his name, just the fact that he was a king. Also I wasn't interested in later chapters, ie. those after ch. 10 where he is first mentioned.

Still, all we have is the man's name. And the fact that he lost a battle. We have no way of knowing anything else about him.