St Peter's occupies the site of two of the university's medieval halls or hostels for students: Trilleck's Inn, later New Inn Hall, and Rose Hall. Trillecks' Inn was founded in the 14th century by Bishop Trilleck and, as New Inn Hall, merged into Balliol College in 1887. Rose Hall was given to New College by William of Wykeham. New College finally sold the site to the rector of St Peter-le-Bailey in 1859 and 1868 as a site for a new church, now the college chapel.