Just think dreaming spires, Inspector Morse, Inspector Lewis etc. and you will have a mental picture of Oxford, probably not a 100% accurate one, but a picture never the less !
Ancestry has just released a set of documents that might place one or two of your ancestors amongst the dreaming spires. Brasenose College Registers 1509 – 1909 lists thousands of students who attended the college in it’s first 400 years. The registers have been compiled from a variety of sources and each entry has a differing amount of information. This is the sort of dataset that you would make a long trip to an archive to search, but is worth running names through just in case.