Johannes Janssen

Not satisfied with attending to the ordinary duties of the classroom, Janssen devoted his spare time to historical research, the results of which were embodied in many learned volumes.

[4] An asylum for the poor and abandoned children of Frankfort, erected in 1894 in the town of Oberursel, owed its existence largely to his efforts.

In 1856 he published a volume of historical documents relating to the Diocese of Munster, Die Geschichtsquellen des Bisthums Münster, 3 vols.

In the essay "Zur Genesis der ersten Theilung Polens" (1865) he explained the circumstances under which the former Kingdom of Poland was robbed of part of its dominions by neighbouring countries.

[3] A French historian quoted in the Revue des Deux Mondes said, "To get impatient with Janssen is easy: to prove that he is wrong, just the reverse.

"[4] The Geschichte, which has passed through numerous editions, has been continued and improved by Ludwig Pastor,[2] and the greater part of it has been translated into English by M. A. Mitchell and A. M. Christie (London, 1896, fol.).