The Holy Martyr Euthalia lived with her mother and brother in Leontina on the island of Sicily. Euthalia's mother, a pagan, suffered for a long while with an issue of blood. Once, the Martyrs Alphaeus, Philadelphus and Cyprian (May 10) appeared to her in a dream and told her she would be healed only if she believed in Christ and was baptized.
After being baptized with her daughter, she was healed of her infirmity. When Euthalia's pagan brother Sirmianus learned of the baptism, went into a violent rage. The mother succeeded in fleeing, but St Euthalia confessed herself a Christian and suffered martyrdom. After fierce tortures, the saint was beheaded with a sword.
Source: oca.org