The Kaplińskis were a Frankist family; his grandfather Eliasz Adam Kapliński was one of the last known Frankists. Leon Kapliński studied law and philosophy in Warsaw and Wrocław (Breslau). He was engaged in revolutionary underground groups, fled from the part of Poland under Russian rule, was briefly held and interrogated by the Prussian police, and took part in the revolutionary movement in 1848.
The Kapliński family were Frankists; Leon Kapliński's grandfather, Eliasz Adam Kapliński, was one of the last known members of that group. He studied law and philosophy in Warsaw and Wrocław (Breslau). He was involved with underground revolutionary groups, fled from the Russian-controlled part of Poland, was briefly detained by Prussian police, and participated in the 1848 revolution.