Hellenization (also spelled Hellenisation) or Hellenism is the adoption of Greek culture, religion, language, and identity by non-Greeks. In the ancient period, colonization often led to the Hellenization of indigenous peoples; in the Hellenistic period, many of the territories which were conquered by Alexander the Great were Hellenized;
The first known use of a verb that means "to Hellenize" was in Greek (ἑλληνίζειν) and by Thucydides (5th century BC), who wrote that the Amphilochian Argives were Hellenized as to their language by the Ambraciots, which shows that the word perhaps already referred to more than language. The similar word Hellenism, which is often used as a synonym, is used in 2 Maccabees (c. 124 BC) and the Book of Acts (c. 80–90 AD) to refer to clearly much more than language, though it is disputed what that may have entailed.
By the 4th century BC, the process of Hellenization had started in southwestern Anatolia's Lycia, Caria and Pisidia regions. (1st century fortifications at Pelum in Galatia, on Baş Dağ in Lycaonia and at Isaura are the only known Hellenistic-style structures in central and eastern Anatolia).
When it was advantageous to do so, places like Side and Aspendos invented Greek-themed origin myths; an inscription published in SEG shows that in the 4th century BC Aspendos claimed ties to Argos, similar to Nikokreon of Cyprus who also claimed Argive lineage. (Argos was home to the Kings of Macedon.) Like the Argeads, the Antigonids claimed descent from Heracles, the Seleucids from Apollo, and the Ptolemies from Dionysus.
The Seuthopolis inscription was very influential in the modern study of Thrace. The inscription mentions Dionysus, Apollo and some Samothracian gods. Scholars have interpreted the inscription as evidence of Hellenization in inland Thrace during the early Hellenistic, but this has been challenged by recent scholarship.
However, Hellenization had its limitations. For example, areas of southern Syria that were affected by Greek culture mostly entailed Seleucid urban centres, where Greek was commonly spoken.