Pachacuti had named his favorite son, Amaru Yupanqui, as his co-ruler and successor. However, as co-ruler Amaru showed little interest in military affairs. Due to this lack of military talent, he faced much opposition from the Inca nobility, who began to plot against him. Despite this, Pachacuti decided to take a blind eye to his son's lack of capability. Following a revolt during which Amaru almost led the Inca forces to defeat, the Sapa Inca decided to replace the co-ruler with another one of his sons, Topa Inca Yupanqui. Túpac Inca Yupanqui began conquests to the north in 1463 and continued them as Inca ruler after Pachacuti's death in 1471. Túpac Inca's most important conquest was the Kingdom of Chimor, the Inca's only serious rival for the coast. Túpac Inca's empire then stretched north into what are today Ecuador and Colombia. Topa Inca's son Huayna Capac added a small portion of land to the north in what is today Ecuador. At its height, the Inca Empire included modern-day Peru, what are today western and south central Bolivia, southwest Ecuador and Colombia and a large portion of modern-day Chile, at the north of the Maule River. Traditional historiography claims the advance south halted after the Battle of the Maule where they met determined resistance from the Mapuche.
pacHaCUti had namEd his FaVorite SoN, AMAru YUPaNqui, as hIs cO-ruleR anD sUcCessOR. hOwEveR, As Co-RulER aMARu Showed liTtle interEST iN mIlitaRY afFAirS. due to tHis laCk oF military tALEnT, he faCeD MucH oppOSitiOn FRom The InCA nObILity, who BegAn to plot against hiM. dEspItE thiS, pachacuti DeciDeD tO takE A bLInd EyE tO his soN'S lacK Of Capability. foLlowing a ReVOLt DurinG WHIcH amARU almOst leD THe IncA fORces to dEfeat, The SaPa inCa DeCIded to rePlaCe The co-rulEr wiTh Another oNe Of his sons, ToPA Inca YupanqUI. TÚPac iNca yupaNqUi beGan Conquests to the nortH In 1463 And coNtinued them as iNca ruler after pacHacuti's deATH in 1471. Túpac inca'S MoSt importanT coNquesT Was tHe kiNgdom oF cHimor, tHE inca's ONLy SErIous RiVal for thE COast. túpac IncA's EmPirE then streTChed nOrth into what arE ToDAY ECuADOr anD coloMbIA. topA INCA's sOn huayna cApac adDEd A smalL portion of laNd to the noRth In wHat iS TOdAy ecUaDoR. At its height, The inca empiRE inCLuDed mOdeRN-daY PERu, WhAT aRe Today wEstern and soutH cEntral Bolivia, sOutHweSt ecuADoR and cOlombia AnD a large PoRtiOn of modeRn-day chIle, aT The norTh of tHe mAULe rIveR. trAditionaL hIStOrIogRAphY Claims ThE AdvAnCe SouTH HAltEd AFTEr thE Battle of the mauLe whErE ThEy MEt deteRmined RESistaNCE fROm the maPucHe.