Arrian of Nicomedia (/ˈæriən/; Latin: Lucius Flavius Arrianus Xenophon; Greek: Ἀρριανός c. AD c. 86 – c. 160) was a Greek historian, public servant, military commander and philosopher of the 2nd-century Roman period. As with other authors of the Second Sophistic, Arrian wrote primarily in Attic (Indica is in Herodotus' Ionic dialect, his philosophical works in Koine Greek).The Anabasis of Alexander is perhaps his best-known work, and is generally considered one of the best sources on the campaigns of Alexander the Great. (It is not to be confused with Anabasis, the best-known work of the Athenian military leader and author Xenophon from the 5th-4th century BC.) Arrian is also considered as one of the founders of a primarily military-based focus on history. His other works include Discourses of Epictetus and Indica.