St John's College is a constituent college of the University of Cambridge. The college was founded by Lady Margaret Beaufort. In constitutional terms, the college is a charitable corporation established by a charter dated 9 April 1511. The aims of the college, as specified by its Statutes, are the promotion of education, religion, learning and research. The college's alumni include the winners of nine Nobel Prizes, seven prime ministers and twelve archbishops of various countries, at least two princes, and three Saints. St John's College is well known for its choir, for its members' participation in a wide variety of inter-collegiate sporting competitions, and for its annual May Ball.