▁some ▁places ) ▁until ▁it ▁was ▁covered ▁completely . ▁ ▁Late ▁Roman ▁n ym pha e um ▁Roman ▁sources ▁mention ▁a ▁S hr ine ▁of ▁the ▁Four ▁N ym ph s ▁( T et ran ym phon ), ▁a ▁n ym pha e um ▁built ▁by ▁Had rian ▁during ▁the ▁construction ▁of ▁A elia ▁Capit ol ina ▁in ▁ 1 3 5 ▁and ▁mentioned ▁in ▁By z antine ▁works ▁such ▁as ▁the ▁ 7 th - century ▁Chron icon ▁Pas ch ale ; ▁other ▁n ym pha ea ▁built ▁by ▁Had rian , ▁such ▁as ▁that ▁at ▁S ag al ass os , ▁are ▁very ▁similar . ▁It ▁is ▁unlikely ▁that ▁this ▁shr ine ▁was ▁built ▁on ▁the ▁site ▁of ▁the ▁Second ▁Temple ▁Pool ▁of ▁Sil o am , ▁but ▁it ▁may ▁have ▁been ▁a ▁prec ursor ▁to ▁the ▁By z antine ▁reconst ruction , ▁below . ▁ ▁By z antine ▁pool ▁and ▁church ▁ ▁In ▁the ▁ 5 th ▁century , ▁a ▁pool ▁was ▁constructed ▁at ▁the ▁end ▁of ▁the ▁Sil o am ▁T unnel , ▁at ▁the ▁beh est ▁of ▁Em press ▁A elia ▁E ud ocia . ▁This ▁pool ▁surv ives ▁to ▁the ▁present ▁day , ▁surrounded ▁on ▁all ▁sides ▁by ▁a ▁high ▁stone ▁wall ▁with ▁an ▁arch ed ▁entrance ▁to ▁He zek iah ' s ▁T unnel . ▁This ▁pool ▁is ▁around ▁ 7 0 ▁yards ▁from ▁the ▁Second ▁Temple ▁Pool ▁of ▁Sil o am , ▁and ▁is ▁significantly ▁smaller . ▁Until ▁the ▁discovery ▁of ▁the ▁Second ▁Temple ▁pool