▁the ▁young est ▁son ▁of ▁Albert ▁I , ▁Prince ▁of ▁An halt - Z er bst , ▁by ▁his ▁second ▁wife ▁Ag nes , ▁daughter ▁of ▁Con rad , ▁Mar gra ve ▁of ▁Brandenburg - St end al . ▁ ▁Life ▁After ▁the ▁death ▁of ▁his ▁father ▁in ▁ 1 3 1 6 , ▁the ▁young ▁Wal dem ar ▁and ▁his ▁older ▁brother ▁Albert ▁II ▁were ▁put ▁under ▁the ▁cust ody ▁of ▁their ▁mat ernal ▁uncle ▁Wal dem ar , ▁Mar gra ve ▁of ▁Brandenburg - St end al . ▁When ▁both ▁brothers ▁reached ▁ad ul th ood , ▁they ▁ruled ▁the ▁princip ality ▁of ▁An halt - Z er bst ▁joint ly . ▁Wal dem ar ▁made ▁his ▁residence ▁in ▁D ess au ▁and ▁Albert ▁in ▁Z er bst ▁or ▁Kö then . ▁ ▁In ▁ 1 3 5 9 ▁Wal dem ar ' s ▁nep hew ▁Albert ▁III ▁was ▁also ▁made ▁co - r uler ▁by ▁his ▁father ▁Albert ▁II , ▁but ▁he ▁soon ▁died . ▁Three ▁years ▁later ▁( in ▁ 1 3 6 2 ), ▁Albert ▁II ▁died ▁and ▁Wal dem ar ▁became ▁co - r uler ▁with ▁his ▁young est ▁nep hew ▁John ▁II . ▁ ▁Six ▁years ▁later , ▁Wal dem ar ▁died , ▁leaving ▁his ▁only ▁son ▁Wal dem ar ▁II ▁as ▁the ▁new ▁co - r uler ▁with ▁John ▁II . ▁ ▁Mar ri ages ▁and ▁Issue ▁On ▁ 2 2 ▁June ▁ 1 3 4 4 ▁Wal dem ar ▁married ▁Elisabeth ▁( d .