Gnaeus Julius Agricola (/əˈɡrɪkələ/; 13 ******0 – 23 August 93) was a Gallo-Roman general responsible for much of the Roman conquest of Britain. Written by his son-in-law Tacitus, the De vita et moribus Iulii Agricolae is the primary source for most of what is known about him, along with detailed archaeological evidence from northern Britain.