▁of ▁Rh ine ▁Province ▁( N orth ▁Rh ine ), ▁and ▁the ▁Free ▁State ▁of ▁Li ppe ▁by ▁the ▁British ▁military ▁administration ▁in ▁Al lied - occup ied ▁Germany . ▁North ▁Rh ine - West phal ia ▁became ▁a ▁state ▁of ▁the ▁Federal ▁Republic ▁of ▁Germany ▁in ▁ 1 9 4 9 , ▁and ▁the ▁city ▁of ▁Bonn ▁served ▁as ▁the ▁federal ▁capital ▁until ▁the ▁reun ification ▁of ▁Germany ▁in ▁ 1 9 9 0 ▁and ▁as ▁the ▁seat ▁of ▁government ▁until ▁ 1 9 9 9 . ▁ ▁History ▁ ▁Rh in eland ▁ ▁The ▁first ▁written ▁account ▁of ▁the ▁area ▁was ▁by ▁its ▁conquer or , ▁Julius ▁Ca esar , ▁the ▁territ ories ▁west ▁of ▁the ▁Rh ine ▁were ▁occupied ▁by ▁the ▁E bur ones ▁and ▁east ▁of ▁the ▁Rh ine ▁he ▁reported ▁the ▁U b ii ▁( ac ross ▁from ▁C ologne ) ▁and ▁the ▁Sug amb ri ▁to ▁their ▁north . ▁The ▁U b ii ▁and ▁some ▁other ▁German ic ▁tribes ▁such ▁as ▁the ▁C ug erni ▁were ▁later ▁settled ▁on ▁the ▁west ▁side ▁of ▁the ▁Rh ine ▁in ▁the ▁Roman ▁province ▁of ▁Germania ▁In fer ior . ▁Julius ▁Ca esar ▁conquer ed ▁the ▁tribes ▁on ▁the ▁left ▁bank , ▁and ▁August us ▁established ▁numerous ▁fort ified ▁posts ▁on ▁the ▁Rh ine , ▁but ▁the ▁Rom ans ▁never ▁succeeded ▁in ▁gain ing ▁a ▁firm ▁foot ing ▁on ▁the ▁right ▁bank , ▁where ▁the ▁Sug amb ri ▁neighb oured ▁several ▁other ▁tribes ▁including ▁the ▁Ten ct eri ▁and ▁Us ip