1625 deaths 16th-century Calvinist and Reformed Christians 17th-century Latin-language writers Dutch geographers 17th-century Dutch historians Frisian scientists German Calvinist and Reformed Christians German geographers 17th-century German historians German male non-fiction writers People from Aurich (district) Rectors of universities in the Netherlands Reformed Churches Christians from the Netherlands Academic staff of the University of Groningen 17th-century German male writers