The Onomasticon (Ancient Greek: Ὀνομαστικόν, Onomastikón), more fully On the Place Names in the Holy Scripture (Περὶ τῶν Τοπικῶν Ὀνομάτων τῶν ἐν τῇ Θείᾳ Γραφῇ, Peri tōn Topikōn Onomatōn tōn en tē Theia Graphē), is a 4th-century gazetteer of historical and then-current place names in Palestine and Transjordan compiled by Eusebius, bishop of Caesarea.
The Onomasticon sits uneasily between the ancient genres of geography and lexicography, taking elements from both but serving as a member of neither.[1] It is widely considered the most important book for the study of Palestine in the Roman period.[2][3][4]
A verbal map of Palestine, the Onomasticon ... Basically a scholarly venture, the Onomasticon's Palestine was a recreation of the biblical promised land occasionally brought up to date.