As documented in "The Silmarillion", Elrond was born at the refuge of the Mouths of Sirion not long before its destruction by the sons of Fëanor, who captured Elrond and his brother Elros.
As documented in "The Silmarillion", Elrond was born in the First Age at the refuge of the Mouths of Sirion. Not long afterwards the havens were destroyed by the sons of Fëanor, who captured Elrond and his brother Elros.