Short answers, pulled from the story.
Christ Church Oxford was founded in 1546 by King Henry VIII, though its origins trace back to 1525 when Cardinal Thomas Wolsey founded Cardinal College on the same site. Henry VIII refounded it under its current name as part of the reorganisation of the Church of England.
Thirteen British prime ministers studied at Christ Church Oxford, the highest number of any Oxbridge college. They include William Ewart Gladstone (1828-1831), Sir Robert Peel (1841-1846), and Anthony Eden (1955-1957).
Great Tom rings 101 times each night at 9:05 pm GMT to mark Oxford time: once for each of the college's original 100 scholars, plus one additional stroke added in 1664. In earlier times the ringing occurred at midnight to signal the close of all college gates across Oxford.
Christ Church is the only institution in the world that is simultaneously a university college and a cathedral. Its head must be an Anglican cleric appointed by the Crown, and its visitor is the reigning British sovereign. The college is also the only Oxford college whose head governs both the academic institution and the cathedral.
Christ Church Oxford was used in the filming of the Harry Potter series and The Golden Compass, the adaptation of Philip Pullman's Northern Lights. These film appearances have made Christ Church the most visited Oxford college, attracting close to half a million tourists each year.
Christ Church alumni include philosopher John Locke, writer Lewis Carroll, poet W. H. Auden, scientist Robert Hooke, and Nobel laureate John B. Gurdon. William Penn, founder of Pennsylvania, King Edward VII, and Albert Einstein, who held a research fellowship, are also associated with the college.