"The following 900 dialectical, moral, physical, mathematical, metaphysical, theological, magical, and cabalistic opinions, including his own and those of the wise Chaldeans, Arabs, Hebrews, Greeks, Egyptians, and Latins, will be disputed publicly by Giovanni Pico of Mirandola, the Count of Concord ... The doctrines to be debated are proposed separately by nations and their sect leaders, but in common in respect to the parts of philosophy - as though in a medley, everything mixed together."
First preface to the 900 Theses.
Pico's library was considered one of the widest of the era and contained manuscripts which are no longer extant; nevertheless, it is impossible to approach his writings without some background knowledge of the traditions he was dealing with.
Here is a collection of biographies and texts which provide a valuable reference for dealing with Pico's 900 Theses. At the moment I have biographies for most of the authors, and eventually I hope to have some e-texts of primary sources for reference purposes, although many of these writings are fairly obscure.