Adjective
Of or pertaining to epigraphs or to epigraphy; as, an epigraphic style; epigraphical works or studies.
Source: Webster's dictionaryPrinceton University Press, 2002, pp. 20/26 As in the case of Trajan, using epigraphical, numismatic, archaeological and other non-literary sources is absolutely necessary in tracing a detailed historical account. Source: Internet
While the earliest Greek inscriptions are dated c. eighth century BCE, epigraphical comparisons to Proto-Canaanite suggest that the Greeks may have adopted the language as early as 1100 BCE, and later "added in five characters to represent vowels". Source: Internet