The last of Philip of Macedon's seven wives, Cleopatra, niece of the Macedonian general and courtier Attalus, was given the name Eurydice on her marriage. Although Philip was a polygamist and already had six wives, the previous matches had all been diplomatic unions enhancing Philip's political or strategic position.
Cleopatra was young and the only one of Philip's wives of Macedonian origin. Moreover, according to Plutarch, Philip had "fallen in love with the girl when he was past the age for it." (Parallel Lives: The Life of Alexander, I, 9, 6.)
The union upset both Olympias, Philip's fourth wife, the mother of his presumed heir, and her son (Alexander the Great). If Philip and Cleopatra produced a son, the child would throw Alexander's inheritance into question.
Cleopatra's uncle, Attalus "being in his cups", was rash enough to call upon the Macedonians "to ask of the gods that from Philip and Cleopatra there might be born a legitimate successor to the kingdom".
According to Plutarch, the incident resulted in a falling out between father and son.
Cleopatra Eurydice and Philip subsequently produced two children, a daughter, Europa, and a son, Caranus.
Following Philip's assassination, Olympias allegedly had both children murdered. Thereupon Cleopatra took her own life. Others have suggested that Alexander ordered the death of Caranus, while the deaths of Europa and Cleopatra are attributed to Olympias's vindictiveness. Attalus also died in the aftermath of Alexander's succession.
Sources:
Plutarch, Parallel Lives: The Life of Alexander