Tags: Name, Surname.
The De Mercy family rose to increasing power during the Middle Ages in the region of what is now southern Belgium Lorraine and Luxembourg.By the fifteenth century Jean de Mercy was lord of Clémarais (1422); in 1477 Roger de Mercy (the Valiant) was appointed Captain and Provost of Longwy by Duke René II of Lorraine. The family progressively expanded their domain incorporating parts of Aix-sur-Cloie Battincourt and Piémont.