Thisquestionshouldbetracedbacktothe3rdiceage,therewerepeoplelivedinBritonisland.ThefirstknownsettlersofBritainweretheIberians.TheycamefromtheEuropeContinentandsettleddownatthesoutheastofBritonIsland.About700B.C.,theCeltsfromthewestofEuropestartedtomoveintheseislands,oneofthemnamesBritons.Atthattime,theCeltshadalreadyknowtheusageofiron,thetechnologyofploughwascontinuingdevelop,andthebegantousecurrency.TheproductivitydevelopmentpromotesthedifferentialoftheCeltssociety.

　　ThenitcomestheRomeInvasion.DuringtheGallicWars,JuliusCaesarinvadedBritaintwice,in55and54B.C.Thefirstinvasionwasmadeinsummer,itwasunsuccessful,butitpavedthewayforthesecondonewhichwashappenedin43A.D.theRomanemperorClaudiustartedanotherincasioninBritain.Thistimehesucceed.TheRomansruledBrtianforalmost300years.

　　In408A.D.theromanhastowithdrawlfromthisisland,itwasownedbythepeoplefromNorthernEurope,TheywereknowastheGemanticpeople,itdividedintothreetribes,Angles,SaxonsandJutes.TheCeltsbecameslavesandmanyofthemwerekilled.

　　By850AD,thecountrywasundersustainedattacksfromVikingraids.ThisistheDenmarkinvasion.Afterthedeathoftheemperor'sgrandson,theAnglo-Saxonpeoplegainthecountryback,butbythe11thcentury,theVikingscamebackagain.thisperiodtheemperorisHarold.afterhisdeath,there'snostrongEnglishsuccessor

　　NormanConquest:in1066tookplaceonthelastsuccessfulinvasionofEngland.DukeWilliamofMormandyinthebattleofHastingdefeatedtheBritish,theNormansfromFranceandotherscomeheretosettle.Intheensuingthreecenturies,theFrenchbecamethelanguageofnobility,thelegalstructurehasbeentheEnglishChannelontheothersideofthepassageofthatsetofconsequences,andsocialstructure,tosomeextentbeenaffected.

　　Aboveallarethemailnlyinvasionhistoryofthiscountry,hopesithelpful.Ihavesomemoreindetailifyouneed.