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".
- ^ Krautheimer, Richard. Early Christian and Byzantine Architecture. Yale University Press, 1986. Fourth edition, with Slobodan Ćurčić. p.518. ISBN 978-0-300-05294-7