STRYMO or RHOIO (Rhoeo) was the Naiad-nymph of a spring, well or fountain of the city of Troy in the Troad (north-western Anatolia). She was a daughter of the river Skamandros (Scamander), the wife of King Laomedon of Troy and the mother of King Priamos (Priam).
[1.1] SKAMANDROS (Apollodorus 3.146, Tzetzes on Lycophron 18)
[1.1] TITHONOS, LAMPOS, KLYTIOS, HIKETAON, PRIAMOS, HESIONE, KILLA, ASTYOKHE (by Laomedon) (Apollodorus 3.146)
[1.2] TITHONOS (by Laomedon) (Tzetzes on Lycophron 18 who calls her Rhoio)
RHOEO (Rhoiô). A daughter of the river-god Scamander, became by Laomedon the mother of Tithonus. (Tzetz. ad Lycoph. 18.)
Source: Dictionary of Greek and Roman Biography and Mythology.
CLASSICAL LITERATURE QUOTES
Pseudo-Apollodorus, Bibliotheca 3. 146 (trans. Aldrich) (Greek mythographer C2nd A.D.) :
"He [Laomedon] in turn married Strymo, daughter of Skamandros (Scamander) . . . and sired sons named Tithonos (Tithonus), Lampos (Lampus), Klytios (Clytius), Hiketaon (Hicetaon), and Podarkes (Podarces) [i.e. Priamos (Priam)], and daughters Hesione, Killa (Cilla), and Astyokhe (Astyoche)."
- Apollodorus, The Library - Greek Mythography C2nd A.D.
Other references not currently quoted here: Tzetzes on Lycophron 18.