▁completed ▁in ▁ 1 8 5 0 . ▁This ▁church ▁was ▁formerly ▁called ▁the ▁C athedral ▁of ▁the ▁Arch di oc ese ▁of ▁Hy der abad . ▁In ▁ 1 8 8 6 , ▁it ▁ceased ▁to ▁be ▁a ▁c athedral . ▁In ▁ 1 8 7 1 , ▁a ▁few ▁n uns ▁from ▁St . ▁Anne ▁at ▁Tur in ▁came ▁here ▁and ▁opened ▁a ▁school ▁that ▁is ▁popular ▁as ▁St . ▁Ann ' s ▁school . ▁ ▁St . ▁Mary ' s ▁Church ▁is ▁the ▁oldest ▁Roman ▁Catholic ▁church ▁in ▁the ▁city ▁of ▁Sec under abad , ▁India . ▁It ▁was ▁formerly ▁the ▁C athedral ▁of ▁the ▁Arch di oc ese ▁of ▁Hy der abad . ▁It ▁is ▁dedicated ▁to ▁the ▁B less ed ▁Virgin ▁Mary . ▁Ad j acent ▁to ▁the ▁church ▁is ▁the ▁convent ▁of ▁St . ▁Ann ' s ▁which ▁runs ▁the ▁ ▁St . ▁Ann ' s ▁High ▁School , ▁Sec under abad . ▁ ▁History ▁The ▁church ▁began ▁with ▁the ▁work ▁of ▁Fr . ▁Daniel ▁Mur phy ▁among ▁Irish ▁C athol ics ▁in ▁the ▁British ▁Army . ▁He ▁arrived ▁in ▁India ▁in ▁ 1 8 3 9 , ▁and ▁began ▁the ▁construction ▁of ▁St . ▁Mary ' s ▁church ▁as ▁a ▁c athedral ▁in ▁ 1 8 4 0 . ▁It ▁was ▁completed ▁and ▁bl essed ▁in ▁ 1 8 5 0 , ▁and ▁was ▁at ▁that ▁time ▁the ▁largest ▁church ▁in ▁Hy der abad ▁State . ▁The ▁church ▁ceased ▁to ▁be ▁a ▁c athedral ▁in ▁