By about 1250, however, the plays would move outdoors into the churchyard and into open fields, town squares, or the city streets. As geographically further from the church, the clergy had less control over the content. The plays were also presented in the local vernacular languages, instead of in Latin, as was the mass. This allowed the message of the Bible to be more accessible to the illiterate audience. These new plays in the vernacular based on Bible stories are called mystery plays. In England, they would sometimes be performed in day-long festivals (often during Corpus Christi) in groups of dozens of plays that traveled through town on wagons. Mystery plays were also written about the lives and miracles of saints, especially the Virgin Mary.