Palaestinus
Could not find Palaestinas in Logeion dictionaries.
Palaestinas Proper-name adjective: feminine accusative plural of Palaestinus
Palaestīnus, a, um, s. Palaestēu. Palaestīna.
Pălæstīnus, (14) a, um, ¶ 1 de la Palestine : in Palæstinæ margine aquæ Ov. F. 2, 464, sur le bord de lʼEuphrate || Palæstinī, m. , Ov. M. 4, 46, c. Palæstinenses ¶ 2 v. Palæste.
Palaest'inus
(Παλαιστῖνος) a son of Poseidon and father of Haliacmon. From grief at the death of his son, Palaestinus threw himself into the river, which was called after him Palaestinus, and subsequently Strymon. (Plut. De Fluv. 11.) [L.S]