In the Kidron Valley in East Jerusalem one can still see, right next to Yad Avshalom, the column remaining from the Beit Hachofshet
. This was the House of Freedom to which King Uziyahu was assigned after becoming a metzora
as punishment for usurping the privilege of offering incense in the Beit Hamikdash
that was reserved for kohanim
A metzora could not reside within the walls of Jerusalem, so his kingly duties were assumed by his son Yotam. Since the responsibilities of a king were so burdensome, his forced release from this burden was seen as a sort of freedom which became the title for his residence.