▁the ▁Dan ube ▁was ▁protected ▁by ▁the ▁establishment ▁of ▁the ▁two ▁colon ies ▁A elia ▁M urs ia ▁and ▁A elia ▁Aqu inc um ▁by ▁Had rian . ▁ ▁Under ▁Dioc let ian , ▁a ▁four fold ▁division ▁of ▁the ▁country ▁was ▁made : ▁ ▁P ann onia ▁Prima ▁in ▁the ▁north west , ▁with ▁its ▁capital ▁in ▁Sav aria ▁/ ▁Sab aria , ▁it ▁included ▁Upper ▁P ann onia ▁and ▁the ▁major ▁part ▁of ▁Central ▁P ann onia ▁between ▁the ▁R aba ▁and ▁Dra va , ▁ ▁P ann onia ▁Val eria ▁in ▁the ▁n ortheast , ▁with ▁its ▁capital ▁in ▁S op ian ae , ▁it ▁compr ised ▁the ▁remainder ▁of ▁Central ▁P ann onia ▁between ▁the ▁R aba , ▁Dra va ▁and ▁Dan ube , ▁ ▁P ann onia ▁Sav ia ▁in ▁the ▁south west , ▁with ▁its ▁capital ▁in ▁S is cia , ▁ ▁P ann onia ▁Sec unda ▁in ▁the ▁sout heast , ▁with ▁its ▁capital ▁in ▁S irm ium ▁ ▁Dioc let ian ▁also ▁moved ▁parts ▁of ▁today ' s ▁Sloven ia ▁out ▁of ▁P ann onia ▁and ▁incorpor ated ▁them ▁in ▁Nor icum . ▁In ▁ 3 2 4 ▁AD , ▁Const antine ▁I ▁en larg ed ▁the ▁borders ▁of ▁Roman ▁P ann onia ▁to ▁the ▁east , ▁an nex ing ▁the ▁pla ins ▁of ▁what ▁is ▁now ▁eastern ▁Hung ary , ▁northern ▁Ser bia ▁and ▁western ▁Roman ia ▁up ▁to ▁the ▁l imes ▁that ▁he ▁created : ▁the ▁Dev il ' s ▁Dy kes .