1 Chronicles 11:4

And David and all Israel went to Jerusalem, which is Jebus; where the Jebusites were, the inhabitants of the land.

The Jerusalem of the verse is Jebus, the stronghold inhabited by the Jebusites, who were a remnant of the Canaanites. They occupied a fortified position on Mount Zion and Mount Moriah that had long been regarded as impregnable. Joab led the Hebrews in besieging and taking it. After its capture it became Israel's national capital, and its heathen name Jebus was changed to Jerusalem.