Philip I Philadelphus - Basileus of Basileía tōn Seleukidōn from 95 BC to 84/83 BC
Philip I Philadelphus was the fourth son of Antiochus VIII Grypus and his wife Tryphaena.

Philip I took the diadem in 95 BC together with his brother (probably twin) Antiochus XI Epiphanes, after the eldest son Seleucus VI Epiphanes was killed by their cousin Antiochus X Eusebes. He established himself in Antiochia after 92 BC and survived attacks from younger brother Demetrius III Eucaerus.

His rule was ended in 83 BC when Tigranes of Armenia conquered Syria, or earlier. He disappears from history at that point, but coins bearing his portrait were issued by later Roman authorities.
Philip I Philadelphus
King Philip I Philadelphus of the Seleucid Empire

(1) Philip I Philadelphus 88/87-76/75 BC
Obverse: diademed head right
Reverse: Zeus seated left, holding Nike in right crowning him with wreath, long scepter vertical in left BAΣIΛEΩΣ / ΦIΛIΠΠOY // EΠIΦANOYΣ / ΦIΛA∆EΛΦOY, N
Ref: Houghton-Lorber II 2463(2)i, Newell...