Chronicon terrae Prussiae, is a chronicle of the Teutonic Knights, by Peter of Dusburg, finished in 1326, the  manuscript was completed some 100 years after which titled series of 13th-century campaigns of Roman Catholic crusaders, primarily led by the Teutonic Knights, to Christianize the pagan Old Prussians?
Chronicon terrae Prussiae Chronicon terrae Prussiae (Latin for "The Chronicle of the Prussian Land") is a chronicle of the Teutonic Knights, by Peter of Dusburg, finished in 1326. The manuscript is the first major chronicle of the Teutonic Order in Prussia and the Grand Duchy of Lithuania, completed some 100 years after the conquest of the crusaders into the Baltic region. It is a major source for information on the Order's battles with Old Prussians and Lithuanians.
Pax Mongolica The Pax Mongolica (Latin for "Mongol Peace"), less often known as Pax Tatarica ("Tatar Peace") is a historiographical term, modelled after the original phrase "Pax Romana", which describes the stabilising effects of the conquests of the Mongol Empire on the social, cultural, and economic life of the inhabitants of the vast Eurasian territory that the Mongols conquered in the 13th and 14th centuries. The term is used to describe the eased communication and commerce the unified administration helped to create, and the period of relative peace that followed the Mongols' vast conquests.