The feast of Corpus Christi, celebrated annually on Thursday after
Trinity Sunday, was devoted to the Eucharist, and the normal practice
was to have solemn processions through the city with the Host, the
consecrated wafer that was believed to have been transformed into the
true body and blood of Jesus. In this way the "cultus Dei" thus
celebrated allowed the people to venerate the Eucharistic bread in order
that they might be stimulated to devotion and brought symbolically, even
mystically into a relationship with the central moments of salvation
history. Perhaps it is logical, therefore, that pageants and plays were
introduced in order to access yet another way of visualizing and
participating in those events. Thus the "invisible things" of the divine
order "from the creation of the world" might be displayed. The York
Corpus Christi Plays, contained in London, British Library, MS. Add.
35290 and comprising more than thirteen thousand lines of verse,
actually represent a unique survival of medieval theater. They form the
only complete play cycle verifiably associated with the feast of Corpus
Christi that is extant and was performed at a specific location in
England.