Bayan mutuwar Burebista, daular da ya halitta ta rabu zuwa kananan masarautu.Daga zamanin Tiberius zuwa Domitian, aikin Dacian ya ragu zuwa yanayin tsaro.Romawa sun yi watsi da shirye-shiryen haɓaka mamayewa da Dacia.A shekara ta 86 AZ, Sarkin Dacian, Decebalus, ya yi nasarar sake haɗa masarautar Dacian a ƙarƙashin ikonsa.Domitian yayi ƙoƙari na gaggawar mamayewa a kan Dacians wanda ya ƙare cikin bala'i.Mamaya na biyu ya kawo zaman lafiya tsakanin Roma da Dacia kusan shekaru goma, har sai Trajan ya zama sarki a shekara ta 98 ​​AZ.Trajan kuma ya ci nasara biyu na Dacia, na farko, a cikin 101-102 CE, ya ƙare cikin nasara na Romawa.An tilasta Decebalus ya amince da tsauraran sharuddan zaman lafiya, amma bai girmama su ba, wanda ya kai ga hari na biyu na Dacia a shekara ta 106 AZ wanda ya kawo ƙarshen ’yancin kan masarautar Dacian.Bayan hadewa cikin daular, Roman Dacia ya ga rabon gudanarwa akai-akai.A cikin 119, an raba shi zuwa sassa biyu: Dacia Superior ("Upper Dacia") da Dacia Inferior ("Lower Dacia"; daga baya mai suna Dacia Malvensis).Tsakanin 124 zuwa kusan 158, Dacia Superior ya kasu kashi biyu, Dacia Apulensis da Dacia Porolissensis.Daga baya za a hade larduna uku a cikin 166 kuma a san su da Tres Daciae ("Dacias Uku") saboda yakin Marcomannic.An bude sabbin ma'adanai da hakar ma'adanai, yayin da noma, kiwo, da kasuwanci suka bunkasa a lardin.Roman Dacia yana da matukar muhimmanci ga sojojin da aka kafa a ko'ina cikin yankin Balkan kuma ya zama lardin birni, wanda aka san kusan garuruwa goma kuma dukansu sun samo asali daga tsoffin sansanonin soja.Takwas daga cikin waɗannan sun kasance mafi girman matsayi na mulkin mallaka.Ulpia Traiana Sarmizegetusa ita ce cibiyar hada-hadar kudi, addini, da majalisa kuma inda mai gabatar da kara (ma'aikacin kudi) ke da kujerarsa, yayin da Apulum ya kasance cibiyar soji ta Roman Dacia.Daga halittarsa, Roman Dacia ya sha fama da barazanar siyasa da soja.The Free Dacians, da ke da alaƙa da Sarmatians, sun yi ta kai hare-hare a lardin.Ƙabilun Carpi (ƙabilar Dacian) ne suka biyo bayansu da kuma ƙabilun Jamusawa da suka zo (Goths, Taifali, Heruli, da Bastarnae) waɗanda ke kawance da su.Duk wannan ya sa lardin da wahala ga sarakunan Romawa su ci gaba da rikewa, wanda aka riga aka yi asara a zamanin Gallienus (253–268).Aurelian (270-275) zai bar Roman Dacia a hukumance a 271 ko 275 CE.Ya kori sojojinsa da gwamnatin farar hula daga Dacia, kuma ya kafa Dacia Aureliana da babban birninta a Serdica a Lower Moesia.An yi watsi da yawan jama'ar Romanized da aka bari, kuma makomarta bayan janyewar Romawa yana da cece-kuce.A cewar wata ka’ida, Latin da ake magana da shi a Dacia, galibi a cikin Romania ta zamani, ya zama yaren Romanian, wanda ya sa Romaniyawa zuriyar Daco-Romawa (yawan Romanized na Dacia).Ka'idar adawa ta nuna cewa asalin Romaniyawa a zahiri ya ta'allaka ne akan yankin Balkan.