Tacitus, Publius/Gaius Cornelius. De Vita et Moribus Iulii Agricolæ (On the Life and Character of Julius Agricola). AD 98:

Gudeman, Alfred, intro, & notes. Tacitus: Agricola and Germania. Boston: Allyn and Bacon, 1900 (1899).
https://archive.org/download/tacitusdevitaet01tacigoog/tacitusdevitaet01tacigoog.pdf