The Centre for the Study of the Cantigas de Santa Maria of Oxford University was created in 2005. It currently hosts two linked research projects: the Cantigas de Santa Maria database and the new Cantigas de Santa Maria critical edition. The Cantigas de Santa Maria database is designed to give access to a vast range of information relevant to the processes of collection, composition and compilation of the Cantigas de Santa Maria. It will provide the critical material for a new edition of the Cantigas de Santa Maria, which will be published both in printed and electronic form. The database is under continual development. The database incorporates a fully searchable electronic version of Poncelet’s ‘Index miraculorum B.V. Mariae quae saec. VI-XV latine conscripta sunt’, and exhaustive listings of the contents of Latin and vernacular collections of Marian miracles.