Florentin of Isenburg-Kempenich was a Lord of Isenburg-Kempenich co-ruling with his brother Theodoric I. Florentin was a son of Reynold, whom he and Theodoric succeeded sometime before 1158. Theodoric and Florentin were mentioned in a document of the Holy Roman Emperor Frederick I Barbarossa in 1158, and in another document in 1166 where Countess Hildegund of Are donated an abbey to the Archbishopric of Cologne. Theodoric and Florentin were also witnesses in 1173 to the granting of independence to the Abbey of Siegburg. Theodoric had died sometime before 1186, leaving Florentin the sole ruler of Kempenich. It is unknown when Florentin died, but he was succeeded by Theodoric's sons, Salentin, Rosemann and Theodoric II.