Ergenia helps establish the contract that brings Hercules to Thrace.
Ergenia approaches Hercules on behalf of her father, and Hercules accepts the offer to train the Thracian army after being promised payment.
Their family connection is dominated by Cotys's cruelty and Ergenia's fear.
The plot identifies Ergenia as Cotys's daughter. She follows his policies out of fear despite disagreeing with his methods.
Ergenia's opposition to Cotys is closely tied to Arius's safety.
Ergenia is distressed by Cotys's threat against Arius, while Arius is identified as the true heir whom she wants to protect.
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