martyrion
/mɑːˈtɪrɪən/(also martyrium)
noun
A shrine, oratory, or church built in memory of a martyr; a building marking the place of a martyrdom or the site of a martyr's relics.
Origin
Mid 17th century; earliest use found in Christopher Cartwright (bap. 1602, d. 1658), Church of England clergyman and religious controversialist. From (i) post-classical Latin martyrium and its etymon (ii) ancient Greek μαρτύριον: see martyre.