Skip to content
Catholic Online Logo


Polemical writer; born at Geffen, Brabant; died at Cologne, 9 July, 1560. He joined the Dominican order at Cologne about 1525. For many years he ably defended the Faith against the heretics by preaching and writing. Later he taught sacred letters at Cologne, and in 1554 was made a doctor of theology. About this same time he became prior of his convent at Cologne, and as such exercised the offices of censor of the faith and papal inquisitor throughout the Archdiocese of Cologne and the Rhine country. In the discharge of these responsible duties Slotanus came into conflict with the learned Justus Velsius, who in 1556, on account of heretical teachings, was obliged to leave Cologne. The vehement writings which Velsius afterwards published against the Cologne theologians moved Slotanus to write two works in which nearly all the heretical doctrines of his time are discussed with admirable skill.

Among his various works those most worthy of mention are: "Disputationum adversus hæreticos liber unus" (Cologne, 1558); "De retinenda fide orthodoxa et catholica adversus hæreses et sectas" (Cologne, 1560); "De barbaris nationibus convertendis ad Christum" (Cologne, 1559). In the last-named work Slotanus witnesses to the ardent missionary zeal which fired the religious men of his time.

More Encyclopedia

The Catholic Encyclopedia is the most comprehensive resource on Catholic teaching, history, and information ever gathered in all of human history. This easy-to-search online version was originally printed between 1907 and 1912 in fifteen hard copy volumes.

Catholic Encyclopedia

Designed to present its readers with the full body of Catholic teaching, the Encyclopedia contains not only precise statements of what the Church has defined, but also an impartial record of different views of acknowledged authority on all disputed questions, national, political or factional. In the determination of the truth the most recent and acknowledged scientific methods are employed, and the results of the latest research in theology, philosophy, history, apologetics, archaeology, and other sciences are given careful consideration.

No one who is interested in human history, past and present, can ignore the Catholic Church, either as an institution which has been the central figure in the civilized world for nearly two thousand years, decisively affecting its destinies, religious, literary, scientific, social and political, or as an existing power whose influence and activity extend to every part of the globe. In the past century the Church has grown both extensively and intensively among English-speaking peoples. Their living interests demand that they should have the means of informing themselves about this vast institution, which, whether they are Catholics or not, affects their fortunes and their destiny.

Copyright © Catholic Encyclopedia. Robert Appleton Company New York, NY. Volume 1: 1907; Volume 2: 1907; Volume 3: 1908; Volume 4: 1908; Volume 5: 1909; Volume 6: 1909; Volume 7: 1910; Volume 8: 1910; Volume 9: 1910; Volume 10: 1911; Volume 11: - 1911; Volume 12: - 1911; Volume 13: - 1912; Volume 14: 1912; Volume 15: 1912

Catholic Online Catholic Encyclopedia Digital version Compiled and Copyright © Catholic Online


Newsletter Sign Up icon

Stay up to date with the latest news, information, and special offers

Subscribe to Catholic OnlineYouTube Channel

the FEED
by Catholic Online

  • Pope Francis orderes sweeping audit of the Vatican
  • Parents' Prayer For Their Children HD Video
  • Prayer For Faith HD Video
  • Daily Readings for Tuesday, December 01, 2015
  • Christmas Presence vs. Presents
  • St. Eligius: Saint of the Day for Tuesday, December 01, 2015
  • You won't believe what happened to this pair of infant twins!

Daily Readings

Reading 1, Isaiah 11:1-10
1 A shoot will spring from the stock of Jesse, a new shoot will grow from ... Read More

Psalm, Psalms 72:1, 7-8, 12-13, 17
1 [Of Solomon] God, endow the king with your own fair judgement, the son ... Read More

Gospel, Luke 10:21-24
21 Just at this time, filled with joy by the Holy Spirit, he said, 'I ... Read More

Saint of the Day

Saint of the Day for December 1st, 2015 Image

St. Eligius
December 1: Eligius (also known as Eloi) was born around 590 ... Read More