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Indeed, logically, since the children fathered by gods on various daughters of either Boeotian or Phliasian Asopus were mortal in these tales, then the daughters themselves must have been mortal, and therefore either the mother of these daughters (often given as Metope daughter of river Ladon) or their father Asopus must have been mortal, or both of them.
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Diodorus Siculus (4,72) similarly presents Asopus (here son of Oceanus and Tethys) as a settler in Phlius and wife of Metope daughter of Ladon, presumably here and elsewhere the Arcadian river Ladon.
48 metopes are hosted in the Adamclisi museum nearby, and one metope is hosted by Istanbul Archaeology Museum, the rest having been lost (There is a reference from Giurescu that two of them fell into Danube River during the transport to Bucharest).