of Macedonian ‘koine’ resulting from the encounter of the idiom of the ‘Aeolic’-speaking populations around Mount Olympus and the Pierian Mountains, whose phonetics had been influenced by a non-Greek (possibly Phrygian or Pelasgian) adstratum, with the Northwest Greek-speaking Argead Macedonians hailing from Argos Orestikon, who founded the kingdom of Lower Macedonia. However, according to Hatzopoulos, B. Helly expanded and improved his own earlier suggestion and presented the hypothesis of a (North-)‘Achaean’ substratum extending as far north as the head of the Thermaic Gulf, which had a continuous relation, in prehistoric times both in Thessaly and Macedonia, with the Northwest Greek-speaking populations living on the other side of the Pindus mountain range, and contacts became cohabitation when the Argead Macedonians completed their wandering from Orestis to Lower Macedonia in the 7th c. BC. According to this hypothesis, Hatzopoulos concludes that the Macedonian dialect of the historical period, which is attested in inscriptions, is a sort of koine resulting from the interaction and the influences of various elements, the most important of which are the North-Achaean substratum, the Northwest Greek idiom of the Argead Macedonians, and the Thracian and Phrygian adstrata. In Macedonian onomastics, most personal names are recognizably Greek (e.g. Alexandros, Philippos, Dionysios, Apollonios, Demetrios), with some dating back to Homeric (e.g. Ptolemaeos) or Mycenean times and there are also a few non-Greek names (Illyrian or Thracian; e.g. "Bithys"). This material supports the observation that Macedonian personal names have a predominantly Greek character. Macedonian toponyms and hydronyms are mostly of Greek origin (e.g. Aegae, Dion, Pieria, Haliacmon), as are the names of the months of the Macedonian calendar and the names of most of the deities the Macedonians worshiped. Hammond states that these are not late borrowings. Macedonian has a close structural and lexical affinity with other Greek dialects, especially Northwest Greek and Thessalian. Most of the words are Greek, although some of these could represent loans or cognate forms. Alternatively, a number of phonological, lexical and onomastic features set Macedonian apart. These latter features, possibly representing traces of a substrate language, occur in what are considered to be particularly conservative systems of the language. Several hypotheses have consequently been proposed as to the position of Macedonian, all of which broadly regard it as either a peripheral Greek dialect, a closely related but separate language (see Hellenic languages), or a hybridized idiom incorporating Brygian, Northwest Greek and Thessalian Greek. Drawing on