Evidence of Zosimus.
Zosimus represents Julian as sending 800 vessels, larger than mere boats, backwards and forwards to Britain for corn to supply the granaries of the cities on the Rhine.[330]
Eumenius.
Eumenius, in his 'Panegyric of Constantine' (A.D. 310), also describes Britain as remarkable for the richness of its corn crops and the multitude of its cattle.[331]
Pliny.
Pliny further describes the inhabitants of Britain as being so far advanced in agriculture as to plough [p248] in marl in order to increase the fertility of the fields.[332]
Tacitus.
Tacitus,[333] in the same way (A.D. circa 90), speaks of the soil of Britain as fertile and bearing heavy crops (patiens frugum), and describes the tricks of the tax gatherers in collecting the tributum, which was exacted in corn.[334]
Strabo.
Strabo[335] (B.C. 30) mentions the export from Britain of 'corn, cattle, gold, silver, iron, skins, slaves, and dogs.'