Professor Horn of Leyden:

(aka Georgius Hornius, 1620–1670) German historian & geographer, professor of history at Leiden University from 1653 until his death.  His Latin works on universal history (Historia ecclesiastica et politica, Arca Noae, Orbis Politicus, Orbis Imperans) were especially influential.  He treated universal history in a modern manner based on the concept of national history.  He was one of the earliest historiographers to divide world history into 3 major epochs, antiquity (from earliest times until the Migration period), the middle period (from the Migration period to 1500 AD) & modern history (1500 to his own day.).

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Migrations of West-Central Europe: * see Endnote 37

a time of widespread migrations of peoples within or into Europe between 375 AD (invasion of the Huns) and 568 AD (Lombard conquest of Italy).  Many of the migrations were movements of Germanic, Hunnic, Slavic, and other peoples into the territory of the then Roman Empire with or without accompanying invasions or war. 

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Ranke (scientific tact):

Ranke was dismissive of all-encompassing philosophies of history.  He saw human agency as critical and dismissed ideas based on a unifying theme, such as Hegel’s concept of history as the unfolding of the universal sprit.  Ranke emphasize that history should be told "the way it happened", in other words without elaborations added by philosophy.  Ranke came to prefer dealing with primary sources as opposed to secondary sources and is seen as a pioneer of critical historical science.  His approach was empirical and based on primary sources and documents.

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purviews:

the range of operation, authority, control or concern; the range of vision, insight, or understanding.