▁most ▁of ▁the ▁eastern ▁Frank ish ▁emp ire ▁at ▁that ▁time . ▁ ▁As ▁a ▁central ▁part ▁of ▁L oth aring ia , ▁the ▁area ▁of ▁modern ▁Lim burg ▁was ▁still ▁deeply ▁involved ▁in ▁Frank ish ▁politics ▁at ▁this ▁time . ▁Zw ent ib old , ▁claim ant ▁to ▁the ▁kingdom ▁of ▁L oth aring ia , ▁died ▁in ▁S ust eren ▁in ▁ 9 0 0 , ▁and ▁had ▁his ▁support ▁in ▁the ▁K em pen ▁area . ▁He ▁was ▁opposed ▁by ▁the ▁local ▁House ▁of ▁Regin ar , ▁who ▁had ▁also ▁changed ▁sides ▁during ▁the ▁Vik ing ▁inc urs ions . ▁Despite ▁their ▁continu ing ▁conflicts ▁with ▁the ▁em per ors , ▁it ▁is ▁from ▁the ▁house ▁of ▁Regin ar ▁that ▁the ▁medieval ▁counts ▁of ▁Lo on ▁are ▁thought ▁to ▁descend , ▁although ▁the ▁exact ▁gene al ogy ▁of ▁this ▁house ▁is ▁highly ▁uncertain . ▁ ▁The ▁area ▁of ▁Belg ian ▁Lim burg ▁under w ent ▁two ▁periods ▁of ▁conversion ▁to ▁Christian ity . ▁The ▁first ▁period ▁was ▁that ▁of ▁St ▁Serv ati us , ▁before ▁the ▁dom ination ▁of ▁the ▁Fran ks . ▁This ▁was ▁only ▁last ing ▁in ▁the ▁roman ised ▁area ▁to ▁the ▁sout heast ▁of ▁Lim burg , ▁around ▁T ong eren , ▁and ▁including ▁nearby ▁Ma astr icht ▁and ▁Li ège . ▁A ▁second ▁period ▁of ▁mission ary ▁activity ▁started ▁around ▁ 7 0 0 AD , ▁after ▁the ▁coming ▁of ▁the ▁pag an ▁Fran ks , ▁Lam bert ▁of ▁Ma astr icht ▁and ▁Will ibr