There were (at least) two games called Barbarian for the 8- and 16-bit micros.
One was written and published by Palace Software (Barbarian: The Ultimate Warrior at Spectrum Computing - Sinclair ZX Spectrum games, software and hardware). The other was written by Psygnosis and published by Melbourne House (Barbarian at Spectrum Computing - Sinclair ZX Spectrum games, software and hardware).
Barcode 5015901700039 is for the ZX Spectrum version of the Psygnosis/Melbourne House version of Barbarian. But in Core it is currently linked to the Palace Software game. It does show the correct cover.