The era of the Roman colonization of Britain is so remote that few antiquaries even ever stop awhile to consider how long those hardy aliens occupied this island, or how effective that occupation was, either in a military or social sense. Four hundred years just measure the length of time the Romans were with us; and what can not be done in so lengthy a period! Four hundred years would suffice to create a high state of civilization from mere savagery, and that is what the Romans accomplished here in that space of time. They not only conquered, but they eventually pacified, the fierce and fearless Britons; and they established export and import trades that rendered Britain the most prosperous colony of the Roman Empire, and the Romano-British merchants and people the wealthiest colonists of those times. Stately villas beyond the towns, but sufficiently near them to invoke, if needs were, the protection of the cohorts, rose up on all sides, where the rich traders in British produce took their ease or engaged themselves in cultivating the cherry and sweet-chestnut trees which they had introduced from the sunny hillsides of Italy. There is to this day a manor at Milton-next-Sittingbourne called "Northwood Chasteners," so called from an ancient grove of chestnuts (_castaneas_), the descendants of the first chestnut trees introduced by the Romans. Vast Roman potteries had their being in the lowlands beside the Medway; Upchurch, Faversham, and Richborough furnished the tables of Roman Emperors and epicures with the "native" oysters that were even then famous and the cause of an immense trade; while manufactures poured in from Rome to suit the British taste.