The original Greek legend Phyllis
Phyllis (Greek: Φυλλίς) is a character in Greek mythology, daughter of a Thracian king (according to some, of Sithon; most other accounts don't give her father's name at all, but one informs that he was named either Philander, Ciasus, or Thelus). She married Demophon, King of Athens and son of Theseus, while he stopped in Thrace on his journey home from the Trojan War.
Demophon, duty bound to Greece, returns home to help his father, leaving Phyllis behind. She sends him away with a coffin with the sacrament of Rhea, asking him to open it only when he has given up hope of returning to her. From here, the story diverges. In one version, Phyllis realizes that he will not return and commits suicide by hanging herself from a tree. Where she is buried, an almond tree grows, which blossoms when Demophon returns to her. In a second version of the story, Demophon opens the caskets and, horrified by what he saw in there, rides off like wild, but his horse stumbles and he accidentally falls on his own sword.