The archive housed in the same complex, comprises various sections. There are, among others, the documents and records pertaining to the Collegiate, documents and registers relating to past church administration, including the eighteenth-century accounts books of the building of the church and those of the 1860s regarding the final building stages.
There are also the records of the lay confraternities established in the same church. It is also the repository of books and other printed matter bequeathed by past canons and priests. These date back mainly to the latter half of the nineteenth century and the first half of the twentieth. The earliest, however, go back to the latter part of the sixteenth century.