ma e ▁or ▁bath house ▁and ▁ ▁a ▁bas il ica . ▁ ▁However , ▁in ▁the ▁winter ▁of ▁ 3 8 4 / 5 , ▁the ▁Dan ube ▁fro ze , ▁allowing ▁the ▁foreign ▁tribes ▁to ▁the ▁north ▁to ▁cross ▁and ▁s ack ▁Hal my ris . ▁ ▁A ▁series ▁of ▁earth qu akes ▁in ▁the ▁ 4 th ▁century ▁and ▁later ▁that ▁alter ed ▁the ▁course ▁of ▁the ▁Dan ube ▁led ▁to ▁the ▁sil ting ▁up ▁of ▁Hal my ris ' ▁har bor ▁and ▁decre ased ▁its ▁economic ▁and ▁strateg ic ▁importance . ▁ ▁The ▁final ▁period ▁of ▁occupation ▁seems ▁to ▁correspond ▁with ▁the ▁reconst ruction ▁of ▁the ▁fort ▁by ▁the ▁em peror ▁Justin ian ▁which ▁included ▁the ▁building ▁of ▁a ▁monument al ▁entrance ▁way ▁in ▁the ▁n ortheast ▁wall ▁of ▁the ▁fort . ▁ ▁Additionally , ▁Hal my ris ▁became ▁the ▁site ▁of ▁one ▁of ▁the ▁major ▁bishop rics ▁in ▁the ▁province ▁as ▁well ▁as ▁being ▁named ▁as ▁one ▁of ▁the ▁fifteen ▁most ▁important ▁towns ▁in ▁the ▁province ▁of ▁S cy th ia . ▁▁ ▁Hal my ris ▁was ▁the ▁most ▁e aster ly ▁point ▁of ▁the ▁Dan ub ian ▁border ▁in ▁Roman ▁times ▁and ▁probably ▁served ▁as ▁a ▁supply ▁centre ▁for ▁the ▁fleet ; ▁early ▁Roman ▁ins cri ptions ▁inform ▁us ▁of ▁the ▁existence ▁of ▁a ▁" mar iner ' s ▁village " — v icus ▁classic orum . ▁During ▁the ▁late ▁Roman ▁period ▁two ▁units ▁of ▁the ▁military ▁fleet — Class is ▁in ▁Pl ate yp eg i