Pytheas undertakes northern voyage from MassaliaJan 1, 325 BCELabels: Pytheas, MassaliaBritannicaEBSCO
Arrival in southwest Britain near tin districtsJan 1, 325 BCELabels: Belerium, CornwallBritannicaIctis
Description of Britain circulates in ancient geographyJan 1, 325 BCELabels: Britain, Greek geographyBritannica
Reports of northern islands and routes emergeJan 1, 325 BCELabels: Orkneys, island routesPliny IVBritannica
Pytheas records Thule six days north of BritainJan 1, 325 BCELabels: Thule, PytheasBritannicaPliny II
Observation of extreme daylight at high latitudeJan 1, 325 BCELabels: Polar daylight, ThulePliny IIPliny IV
Amber regions and far northern Europe enter reportsJan 1, 325 BCELabels: Amber regions, BalticBritannicaPliny IV
Pliny preserves key Thule details for later agesJan 1, 77Labels: Pliny the, compilationPliny IIPliny IV