▁includes ▁three ▁Arch di oc ese - wide ▁con greg ations : ▁the ▁Ge ' ez ▁R ite ▁pract iced ▁by ▁Eth iop ian , ▁E rit re an , ▁and ▁Egypt ian ▁C athol ics ; ▁the ▁German ▁Apost olate ; ▁and ▁the ▁Tr ident ine ▁Mass ▁Catholic ▁community . ▁The ▁first ▁of ▁these ▁con greg ations ▁moved ▁to ▁the ▁c athedral ▁from ▁the ▁nearby ▁Holy ▁Tr inity ▁Catholic ▁Church ▁in ▁ 1 9 9 4 , ▁the ▁other ▁two ▁in ▁ 2 0 0 8 . ▁ ▁History ▁In ▁ 1 8 6 0 , ▁Bishop ▁John ▁Fitz pat rick ▁recognized ▁that ▁the ▁church ▁in ▁Boston ▁had ▁out g rown ▁the ▁old ▁Holy ▁Cross ▁C athedral ▁on ▁Franklin ▁St . ▁However , ▁plans ▁for ▁the ▁new ▁c athedral ▁were ▁dis rupted ▁by ▁the ▁out break ▁of ▁the ▁United ▁States ▁Civil ▁War . ▁Bishop ▁Fitz pat rick ▁died ▁in ▁ 1 8 6 6 ▁and ▁Bishop ▁John ▁Williams ▁took ▁over ▁planning ▁for ▁the ▁c athedral ▁project . ▁Gr ound ▁was ▁broken ▁on ▁April ▁ 2 9 , ▁ 1 8 6 6 ▁and ▁the ▁completed ▁structure ▁was ▁dedicated ▁on ▁December ▁ 8 , ▁ 1 8 7 5 ▁by ▁Williams , ▁who ▁was ▁by ▁then ▁Boston ' s ▁first ▁arch bishop . ▁ ▁The ▁C athedral ▁was ▁named ▁after ▁the ▁re lic ▁of ▁ ▁holy ▁cross ▁that ▁is ▁owned ▁by ▁the ▁church . ▁This ▁re lic , ▁supposed ly ▁a ▁small ▁fragment ▁of ▁the ▁cross ▁from ▁Jesus ' ▁cru c if ix