Acusilaus, a notable historian and mythographer from Argos, emerged in the latter half of the sixth century BC. He is recognized as the son of either Cabas or Scabras, though the exact details of his lineage remain uncertain. His contributions to the field of Greek literature are primarily preserved in fragments and summaries, with his works being compiled in Felix Jacoby's influential collection, Die Fragmente der griechischen Historiker.
While the precise origins of Acusilaus—whether from Peloponnesian or Boeotian Argos—are debated, he is sometimes included among the esteemed Seven Sages of Greece. His writings, particularly genealogies, are believed to have been composed around five hundred BC, with three books of these genealogies cited in historical texts. Notably, much of his work appears to be a prose translation of Hesiod's poetry.
Acusilaus claimed to have derived some of his genealogical information from bronze tablets unearthed in his garden, a source that has drawn skepticism from modern scholars. His writings were crafted in the Ionic dialect, aligning with the style of many logographers of his time. The philosopher Plato is recognized as the earliest author to mention Acusilaus, although the authenticity of works attributed to him in later periods has been called into question.