Monounios is considered the successor of
Glaucias of
Taulantii, whose reign lasted until at least 295 BC. Between 284 and 282 BC southern Illyria was threatened by
Pyrrhus of Epirus, who succeeded in seizing part of the country, including the city of
Apollonia and the territory of certain tribes. It has been suggested that Pyrrhus' operations in Illyria ended in 282 BC. Already succeeding to face Epirote offensive in the previous years, Pyrrhus' departure to Italy in 280 BC enabled Monounios to strengthen his power politically and economically, consolidatating the structures of the Illyrian state. Minting his own coinage reflected Monounios' financial power. The Illyrian king aligned with the most valuable currency in the region – the silver stater of
Dyrrachion – and transformed it, in stages, into his own currency. The fact that Monounios' coins were struck in the city mint of
Dyrrhachion stresses that he exercised to some extent his authority over the city, as did his successor and probably son
Mytilos later. Monounios was involved in the dynastic struggles in
Macedon, waging war as an ally of
Lysimachus' son,
Ptolemy Epigonos, against
Ptolemy Ceraunos, as reported by
Pompeius Trogus (1st century BC). The war likely began in spring 280 BC, just a few months after the murder of Ptolemy Epigonos' brothers, and lasted at least until the
Gallic invasion in early 279. The situation in 279 BC was seemingly a large-scale regional conflict, which besides the "
Celts" and
Macedonians, also involved ethnic Illyrians led by king Monounios and Ptolemy Epigonos, a pretender to the Macedonian throne. A helmet with the inscribed name of the king (ΜΟΝΟΥΝΙΟΥ [ΒΑ]ΣΙΛΕΩ[Σ]) was found in the area of
Lake Ohrid. Dating back to the 3rd century BC, these inscriptions of Monounios are considered the oldest known in the area. It is thought that Monounios was buried in the
Royal Tombs of Selca e Poshtme. == Minting of coins ==