
1) Christian architecture
Found on
https://www.crosswordclues.com/clue/martyrium

Latin, meaning: n, martyrdom
Found on
http://archives.nd.edu/mmm.htm
[architecture] A martyrium is a structure built at `a site which bears witness to the Christian faith, either by referring to an event in Christ`s life or Passion, or by sheltering the grave of a martyr`. Martyria, mostly small, were very common after the early 4th century, when Constantine became the first emperor to make the Nicene Creed ...
Found on
http://en.wikipedia.org/wiki/Martyrium_(architecture)

shrine erected in memory of a martyr
Found on
http://phrontistery.info/m.html

A chapel attached to the tomb and/or relics of a Christian martyr which often developed into a major church or cathedral.
Found on
http://www.encyclo.co.uk/visitor-contributions.php

A church or other building erected on a site sacred to Christianity, symbolising a place of martyrdom or marking the grave of a martyr.
Found on
http://www.virtualani.org/glossary/index.htm

martyrium 1. A shrine erected in memory of a martyr. 2. A church or other edifice built at a site, especially a tomb, associated with a Christian martyr or saint.
Found on
http://www.wordinfo.info/words/index/info/view_unit/2877/

An edifice built over the site of a tomb of a martyr frequently became the site of cathedrals.
Found on
https://www.encyclo.co.uk/local/22199
No exact match found.