▁of ▁the ▁fourth ▁century . ▁After ▁the ▁con quest ▁of ▁C á cer es ▁in ▁ 1 1 6 9 ▁by ▁Ferdinand ▁II ▁of ▁Leon , ▁the ▁temple ▁was ▁converted ▁into ▁a ▁chap el ▁of ▁St . ▁Julian ; ▁one ▁reason ▁the ▁building ▁remains ▁so ▁well - pres erved . ▁The ▁conversion ▁saw ▁the ▁addition ▁of ▁a ▁b elf ry ▁and ▁a ▁sk ull ▁with ▁tib ias . ▁The ▁temple ▁would ▁eventually ▁become ▁a ▁mil estone ▁along ▁the ▁pil gr image ▁route ▁to ▁Santiago ▁de ▁Com post ela . ▁The ▁architect ▁was ▁buried ▁in ▁the ▁temple ; ▁his ▁tomb ▁is ▁still ▁preserved ▁inside . ▁ ▁Architecture ▁ ▁Alc ánt ara ▁is ▁a ▁small ▁vot ive ▁temple ▁in ▁ant is , ▁rect angular , ▁with ▁a ▁single ▁camera ▁or ▁cell . ▁The ▁temple ▁is ▁constructed ▁of ▁gran ite . ▁The ▁entrance ▁is ▁fl ank ed ▁by ▁two ▁T us can ▁columns ▁and ▁accessed ▁by ▁an ▁exterior ▁st air case , ▁covered ▁with ▁a ▁g abled ▁roof ▁made ▁of ▁sl abs ▁of ▁stone , ▁with ▁a ▁ped iment ▁with ▁trim ▁at ▁the ▁edges ▁and ▁a ▁smooth ▁tym pan um ▁without ▁decor ation . ▁The ▁bill ▁is ▁rem in is cent ▁of ▁the ▁Tre as ury ▁of ▁Ath ens ▁at ▁Del phi . ▁The ▁bridge ▁and ▁temple ▁are ▁built ▁with ▁gran ite ▁blocks ▁of ▁equal ▁size . ▁ ▁In scri ptions ▁Pres ented ▁in ▁the ▁l int el ▁of ▁the ▁temple ▁are ▁ins cri ptions ▁( now ▁are ▁not ▁original , ▁but ▁subsequent ▁copies ▁as ▁the