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Llyfr llawn ffeithiau difyr na wyddech chi am Gymru. Cyflwynir hanesion am gyfraniad helaeth y genedl fechan hon i'r byd - eu deddfau canoloesol blaengar, llinach frenhinol effeithiol, arloeswyr y Chwyldro Diwydiannol a magwrfa un o brif weinidogion mwyaf galluog Prydain.