, ▁it ▁was ▁inv aded ▁by ▁various ▁C elt ic ▁tribes . ▁Little ▁is ▁known ▁of ▁P ann onia ▁until ▁ 3 5 ▁BC , ▁when ▁its ▁inhabitants , ▁al lies ▁of ▁the ▁Dal m ati ans , ▁were ▁attacked ▁by ▁August us , ▁who ▁conquer ed ▁and ▁occupied ▁S is cia ▁( S is ak ). ▁The ▁country ▁was ▁not , ▁however , ▁definit ively ▁sub du ed ▁by ▁the ▁Rom ans ▁until ▁ 9 ▁BC , ▁when ▁it ▁was ▁incorpor ated ▁into ▁Il ly ric um , ▁the ▁front ier ▁of ▁which ▁was ▁thus ▁extended ▁as ▁far ▁as ▁the ▁Dan ube . ▁ ▁Under ▁Roman ▁rule ▁ ▁In ▁AD ▁ 6 , ▁the ▁P ann oni ans , ▁with ▁the ▁Dal m ati ans ▁and ▁other ▁Il ly rian ▁tribes , ▁engaged ▁in ▁the ▁so - called ▁Great ▁Il ly rian ▁Revol t , ▁and ▁were ▁overcome ▁by ▁T iber ius ▁and ▁German icus , ▁after ▁a ▁hard - f ought ▁campaign , ▁which ▁last ed ▁for ▁three ▁years . ▁After ▁the ▁re bell ion ▁was ▁cr ushed ▁in ▁AD ▁ 9 , ▁the ▁province ▁of ▁Il ly ric um ▁was ▁dissol ved , ▁and ▁its ▁lands ▁were ▁divided ▁between ▁the ▁new ▁provinces ▁of ▁P ann onia ▁in ▁the ▁north ▁and ▁Dal mat ia ▁in ▁the ▁south . ▁The ▁date ▁of ▁the ▁division ▁is ▁unknown , ▁most ▁certainly ▁after ▁AD ▁ 2 0 ▁but ▁before ▁AD ▁ 5 0 . ▁The ▁proxim ity ▁of ▁dangerous ▁bar bar ian ▁tribes ▁( Qu