Joannes (or Ioannes) Florentius a Kempis (Brussels, baptised on 1 August 1635 – after 1711) was a Flemish Baroque composer and organist.
[1] Joannes Florentius was born in Brussels as the fifth son of Nicolaes a Kempis, an organist and composer.
Between 1670 and 1672, he succeeded to his father's position as an organist at the St. Michael and Gudula Cathedral in Brussels.
The authors included composers Petrus Hurtado, Guillielmus Borremans, Gaspar de Verlit, Joannes vander Wielen and Franciscus Loots.
[2] Furthermore, a Kempis published a mass, a sequence Victimae paschalis and twelve sonatas for violin, viola da gamba and double bass.