6 ▁by ▁Ernest ▁August us ' s ▁son ▁George ▁V ▁of ▁Han over , ▁Austria ' s ▁al ly ▁during ▁the ▁Aust ro - Pr uss ian ▁War , ▁when ▁it ▁was ▁an nex ed ▁by ▁Pr uss ia ▁after ▁Austria ' s ▁defeat , ▁and ▁became ▁the ▁Pr uss ian ▁province ▁of ▁Han over . ▁The ▁W elf s ▁went ▁into ▁ex ile ▁at ▁G m unden , ▁Austria , ▁where ▁they ▁built ▁C umber land ▁Castle . ▁ ▁Brun sw ick ▁succession ▁▁ ▁The ▁senior ▁line ▁of ▁the ▁dynast y ▁had ▁ruled ▁the ▁much ▁smaller ▁princip ality ▁of ▁Brun sw ick - W olf en b ütt el , ▁created ▁the ▁so ver eign ▁Duch y ▁of ▁Brun sw ick ▁in ▁ 1 8 1 4 . ▁This ▁line ▁became ▁ext inct ▁in ▁ 1 8 8 4 . ▁Although ▁the ▁Duch y ▁should ▁have ▁been ▁inherited ▁by ▁the ▁Duke ▁of ▁C umber land , ▁son ▁of ▁the ▁last ▁king ▁of ▁Han over , ▁Pr uss ian ▁susp ic ions ▁of ▁his ▁loyal ty ▁led ▁the ▁du chy ' s ▁throne ▁to ▁remain ▁vac ant ▁until ▁ 1 9 1 3 , ▁when ▁the ▁Duke ▁of ▁C umber land ' s ▁son , ▁Ernst ▁August , ▁married ▁the ▁daughter ▁of ▁Kaiser ▁Wilhelm ▁II ▁and ▁was ▁allowed ▁to ▁inherit ▁it . ▁His ▁rule ▁there ▁was ▁short - l ived , ▁as ▁the ▁mon archy ▁came ▁to ▁an ▁end ▁following ▁the ▁First ▁World ▁War ▁in ▁ 1 9 1 8 . ▁ ▁The