Expeditions to Prussia and the Holy Land : made by Henry, Earl of Derby (afterwards King Henry IV) in the years 1390-1 and 1392-3 : being the accounts kept by his treasurer for two years

The Camden Society was a precursor of the Royal Historical Society, and published a range of important historical sources between 1845 and 1896. The Camden Series continued to be published after 1896 by the RHS in the 3rd series of Camden titles.