Finds from the Stone Age, remnants of Roman settlements and graves from Merovingian times bear witness to the municipality's early days.

[3] As early as 1050, Mesenich had its first documentary mention in connection with the Polish queen and count palatine's daughter Richeza's donation to the Brauweiler Benedictine Monastery near Cologne.

[1] The German blazon reads: Im Blau einen nach halbrechts gewandten Bischof in goldenem Gewand mit Mitra und Stab in der Linke, mit der Rechten einen silbernen schwebenden Anker segnend, zu seinen Füßen einen silbernen Schild, darin ein roter Adler, hinter dem ein Bischofstab schräglinks zu sehen ist.

The municipality’s arms might in English heraldic language be described thus: Azure Saint Nicholas in trian aspect proper vested and mitred Or, in his sinister hand a bishop’s staff of the same, his dexter hand raised in benediction over an anchor argent, surmounting his legs an inescutcheon of the same charged with an eagle displayed gules surmounting a bishop’s staff bendwise sinister of the first.

The inescutcheon at the saint's feet is the Brauweiler Monastery's arms, thus representing the municipality's former feudal lords, who also held court jurisdiction.