Hesiod was a Greek oral poet, his date is uncertain but leading scholars agree that Hesiod lived in the latter half of the Eighth-century BCE. Since at least Herodotus's time Hesiod and Homer have generally been considered the earliest Greek poets whose work has survived, and they are often paired. Scholars disagree about who lived first, and the fourth-century BCE sophist Alcidamas' Mouseion even brought them together in an imagined poetic agon, the Contest of Homer and Hesiod. Aristarchus first argued for Homer's priority, a claim that was generally accepted by later antiquity. Hesiod's writings serve as a major source on Greek mythology, farming techniques, archaic Greek astronomy and ancient time-keeping.