King David. Before that, Jerusalem was a Jebusite stronghold.

the 10th century BCE, although it is possible that an earlier Jebusite sanctuary had stood on the site.

The term "Jebusite" refers to the ancient people who inhabited the city of Jerusalem before it was conquered by King David. They were one of the Canaanite tribes living in the region during biblical times.

Zion is the name of a place in Israil. It is basically a mountain which is considered to be holy near Jerusalem (Mount Zion), on which stood a Jebusite fortress of the same name that was conquered by David and was named the City of David.

Zion is a place name often used as a synonym for Jerusalem.The word is first found in Samuel II, 5:7.

It commonly referred to a specific mountain near Jerusalem (Mount Zion) then the term Zion came to mean the area of Jerusalem where a Jebusite fortress once stood. Later Zion became a metonym for Solomon's Temple in Jerusalem, the city of Jerusalem and generally, the World to Come.