At which University of Oxford college did C.S. Lewis hold his long academic fellowship?

C.S. Lewis held his long academic fellowship at Magdalen College, Oxford.

Lewis was elected a fellow and tutor in English at Magdalen College in 1925. He remained there until 1954, teaching English literature and developing the scholarly and literary career that made him internationally known. Magdalen's medieval buildings and riverside grounds became familiar settings in accounts of his Oxford life.

At Oxford, Lewis was part of an influential circle that included J.R.R. Tolkien and Charles Williams. He also hosted meetings of the Inklings, an informal literary discussion group associated with Oxford writers, at the Eagle and Child pub and in college rooms.

Lewis left Oxford for Cambridge in 1954, when he became the first occupant of the newly established chair of Medieval and Renaissance Literature at Magdalene College, Cambridge. Magdalen College, Oxford and Magdalene College, Cambridge are separate institutions despite their similar names.