Bridled-Horse (zeuxis, hippos)
ZEUXIPPE was the Naiad-nymph of a well or fountain of the city of Athens in Attika (southern Greece). She was the wife of the King Pandion and the mother of several children including Philomela and Prokne (Procne)--two young women who were transformed into birds.
[1.1] PROKNE, PHILOMELA, EREKHTHEUS, BOUTES (by Pandion) (Apollodorus 3.14.8)
[1.2] BOUTES (by Teleon) (Hyginus Fabulae 14)
ZEUXIPPE (Zeuxippê). A sister of Pasithea or Praxithea, was a Naiad and married to Pandion, by whom she became the mother of Procne, Philomela, Erechtheus and Butes. (Apollod. iii. 14. § 8.)
Source: Dictionary of Greek and Roman Biography and Mythology.
CLASSICAL LITERATURE QUOTES
Pseudo-Apollodorus, Bibliotheca 3. 14. 8 (trans. Aldrich) (Greek mythographer C2nd A.D.) :
"Pandion married Zeuxippe, his mother's [i.e. Praxithea's] sister, and begat two daughters, Prokne (Procne) and Philomela, and twin sons, Erekhtheus (Erechtheus) and Boutes (Butes)."
Pseudo-Apollodorus, Bibliotheca 3. 196 :
"Erekhtheus (Erechtheus) [King of Athens] married Praxithea, daughter of Phrasimos and Kephisos' (Cephisus') daughter Diogeneia." [N.B. Praxithea was Zeuxippe's sister (see quote above).]
Pseudo-Hyginus, Fabulae 14 (trans. Grant) (Roman mythographer C2nd A.D.) :
"Argonauts : . . . Butes, son of Teleon and Zeuxippe, daughter of the river Eridanus, from Athens."
- Apollodorus, The Library - Greek Mythography C2nd A.D.
- Hyginus, Fabulae - Latin Mythography C2nd A.D.