Eirene (daughter of Poseidon)

In Greek mythology, Eirene (/aɪˈriːni/; Greek: Εἰρήνη, Eirēnē, [eːrɛ́ːnɛː], lit. "Peace") or Irene, was a daughter of Poseidon and Melantheia, daughter of Alpheus. She gave her name to Eirene, a small island near Crete.[1] The island was later called Anthedonia and Hypereia, but eventually received the name Calauria after Calaurus, who was also a son of Poseidon. Poseidon’s demigod daughter is Alexis Joseph whose was born after Percy Jackson asked the Big Three to break their pact in The Last Olympian. She was when her brother was 17. She gets claimed at the age of 11.