▁to ▁be ▁re built ▁after ▁the ▁destruction ▁by ▁Neb uch ad ne zz ar ▁from ▁ 5 8 6 - 8 7 ▁and ▁the ▁return ▁from ▁Bab yl onian ▁capt ivity , ▁the ▁pool ▁was ▁also ▁known ▁as ▁the ▁King ' s ▁Pool ▁( ). ▁ ▁He zek iah ' s ▁Lower ▁Pool ▁The ▁( Lower ) ▁Pool ▁of ▁Sil o am ▁was ▁built ▁during ▁the ▁reign ▁of ▁He zek iah ▁( 7 1 5 – 6 8 7 / 6 ▁B CE ), ▁to ▁leave ▁bes ie ging ▁arm ies ▁without ▁access ▁to ▁the ▁spring ' s ▁waters . ▁The ▁pool ▁was ▁fed ▁by ▁the ▁newly ▁constructed ▁Sil o am ▁tunnel . ▁The ▁old ▁C ana an ite ▁tunnel ▁had ▁been ▁very ▁vulner able ▁to ▁attack ers , ▁so , ▁under ▁threat ▁from ▁the ▁Ass y rian ▁king ▁S enn acher ib , ▁He zek iah ▁se aled ▁up ▁the ▁old ▁out let ▁of ▁the ▁Gi hon ▁Spring ▁and ▁the ▁Upper ▁Pool , ▁and ▁built ▁the ▁new ▁under ground ▁Sil o am ▁tunnel ▁in ▁place ▁of ▁the ▁older ▁tunnel ▁( ). ▁During ▁this ▁period ▁the ▁Pool ▁of ▁Sil o am ▁was ▁therefore ▁sometimes ▁known ▁as ▁the ▁Lower ▁Pool ▁( ). ▁ ▁H asm one an ▁pool ▁ ▁The ▁pool ▁was ▁re construct ed ▁no ▁earlier ▁than ▁the ▁reign ▁of ▁Alexander ▁J ann ae us ▁( 1 0 3 - 7 6 ▁B CE ), ▁although ▁it ▁is ▁not ▁clear ▁whether ▁this ▁pool ▁was ▁in ▁the ▁same ▁location ▁as ▁the ▁earlier ▁pool ▁built