certain abuses in the celebration of Mass, edited by Michael Lochmayer (Heidelberg, 1489), and often thereafter De contractibus emotionis et venditionis, an important work on the politico-economical views of his times, published among the works of Jean Gerson (Cologne, 1483), IV, 185–224. Summa de republica, a work on public law Cathedra Petri, a work on ecclesiastical policy. Notes References Otto Hartwig, Henricus de Langenstein dictus de Hassia: zwei Untersuchungen über das Leben und die Schriften Heinrichs von Langenstein (Marburg, 1857) Ferdinand Wilhelm Emil Roth, Zur Bibliographie des Henricus Heinbuche de Hassia, dictus de Langenstein in II. Beiheft zum Centralblatt für Bibliothekswesen (Leipzig, 1888) August Kneer, Die Entstehung der Konziliaren Theorie. Zur Geschichte des Schismas und der Kirchen politischen Schriftsteller K. von Gelnhausen and H. von Langenstein (Rome, 1893) Franz Placidus Bliemetzrieder, Des General Konzil im grossen abendländischen Schisma (Paderborn, 1904), passim Joseph Aschbach, Geschichte der Wiener Universität (Vienna, 1865), I, 366-402 F. J. Scheuffgen, Beiträge zur Geschichte des grossen Schismas (Freiburg im Br., 1889), 35 sqq. Georg von Peuerbach, "Viri mathematici". In: Tabulae Eclypsium (1514) Further reading Shank, Michael. Unless you believe, you shall not understand: Logic, University and Society in Late Medieval Vienna. Princeton University Press, 1988. Steneck, Nicholas. Science and Creation in the Middle Ages: Henry of Langenstein (d. 1397) on Genesis. University of Notre Dame Press, 1977. 1320s births 1397 deaths Year of birth uncertain 14th-century German Catholic theologians 14th-century philosophers 14th-century German mathematicians Medieval German mathematicians 14th-century Latin writers