 The Library of Gray 's Inn has existed since at least 1555 , when the first mention of it was made in the will of Robert Chaloner , who left some money to buy law books for the Library . The Library was neither a big collection nor a dedicated one ; in 1568 it was being housed in a single room in the chambers of Nicholas Bacon , a room that was also used for mooting and to store the deed chest . The collection grew larger over the years as individual Benchers such as Sir John Finch and Sir John Bankes left books or money to buy books in their wills , and the first Librarian was appointed in 1646 after members of the Inn had been found stealing books . 
