Armenia was a monolingual country by the 2nd century BC at the latest. Its language has a long literary history, with a 5th-century Bible translation as its oldest surviving text. Its vocabulary has historically been influenced by Western Middle Iranian languages, particularly Parthian,; its derivational morphology and syntax were also affected by language contact with Parthian, but to a lesser extent. Contact with Greek, Persian, and Syriac also resulted in a number of loanwords. There are two standardized modern literary forms, Eastern Armenian and Western Armenian, with which most contemporary dialects are mutually intelligible.