▁University , ▁where ▁he ▁spent ▁one ▁sem ester . ▁ ▁Oscar ▁became ▁Crown ▁Prince ▁in ▁ 1 8 1 8 ▁upon ▁the ▁death ▁of ▁his ▁adopt ive ▁grand father , ▁and ▁the ▁acc ession ▁of ▁Charles ▁John ▁to ▁the ▁Swedish ▁and ▁Norwegian ▁thr ones . ▁ ▁In ▁ 1 8 3 2 - 3 4 ▁he ▁completed ▁the ▁rom antic ▁opera ▁R yn o , ▁the ▁err ant ▁kn ight , ▁which ▁had ▁been ▁left ▁un fin ished ▁on ▁the ▁death ▁of ▁the ▁young ▁composer ▁Edu ard ▁Br end ler . ▁In ▁ 1 8 3 9 ▁he ▁wrote ▁a ▁series ▁of ▁articles ▁on ▁popular ▁education , ▁and ▁in ▁ 1 8 4 1 ▁an onym ously ▁published ▁Om ▁Stra ff ▁och ▁stra ff an stal ter , ▁a ▁work ▁advoc ating ▁prison ▁re forms . ▁ ▁Mar riage ▁and ▁issue ▁ ▁Se ek ing ▁to ▁legit im ise ▁the ▁new ▁Bern ad otte ▁dynast y , ▁Charles ▁XIV ▁John ▁had ▁selected ▁four ▁prin cess es ▁as ▁candidates ▁for ▁marriage , ▁in ▁order ▁of ▁his ▁priority : ▁▁ ▁Vil helm ina ▁of ▁Den mark ▁( born ▁ 1 8 ▁January ▁ 1 8 0 8 ), ▁daughter ▁of ▁Frederick ▁VI ▁of ▁Den mark ▁and ▁Marie ▁Soph ie ▁of ▁H esse - K ass el ▁( ult imately ▁she ▁married ▁first ▁Frederick ▁VII ▁of ▁Den mark ▁and ▁second ▁Karl , ▁Duke ▁of ▁Schles wig - Hol stein - S onder burg - G l ück s burg ) ▁ ▁Joseph ine ▁of ▁Le uch