Their brother, Phaeton, died after attempting to drive his father's chariot (the sun) across the sky. He was unable to control the horses and fell to his death. The Heliades grieved for four months and the gods turned them into poplar trees and their tears into amber. According to some sources, their tears (amber) fell into the river Eridanos.
, the Heliades ("children of the sun") were the daughters of Helios HĂȘlios (Greek for "the sun"), whom Homer equates with the sun titan Hyperion.
One belonged to the Hesperides, another to the Heliades, and the third was a Naiad occasionally considered the mother of the Charites by Helios.
According to some sources, their tears (amber) fell into the river Eridanos The river Eridanos (or Eridanus) is an imagined river of Greek mythology whose name has been adopted by paleogeographers to describe the real ice age river that ran in the bed of the Baltic Sea, see Eridanus (geology).