The reconstruction of Jerusalem's walls was a collaborative effort that included individuals holding official leadership roles. Among these builders was Rephaiah son of Hur, a man who possessed governmental authority within the city.
The primary approach among commentators understands his specific title as denoting a geographic jurisdiction. Drawing on ancient translations that use similar terms for regions and districts [מצודת ציון, אבן עזרא], this view concludes that Rephaiah governed half of the Jerusalem district [רלב״ג, מצודת דוד]. The actual scope of this leadership role was relatively limited, reflecting the fact that the city's population was quite small during that historical period [ביאור שטיינזלץ].
Other scholars understand his position differently, moving away from a strict geographic division of the land. One perspective suggests his title reflects authority, rule, and kingship, meaning he was appointed to govern half of the actual people residing in Jerusalem rather than a specific territory [רש״י]. A separate and unique interpretation suggests his jurisdiction was highly localized, referring specifically to a certain corner area of the city [ר' סעדיה גאון].