Thomas à Kempis, CRV (c. 1380 – 25 July 1471; German: Thomas von Kempen; Dutch: Thomas van Kempen) was a German-Dutch Catholic canon regular of the Augustinians and the author of The Imitation of Christ, one of the best known Christian devotional books. His name means "Thomas of Kempen", Kempen, Germany, being his home town. He was a member of the Congregation of Windesheim, which was part of the Modern Devotion, a reform movement during the late medieval period.
https://en.wikipedia.org/wiki/Thomas_%C3%A0_Kempis