▁ 1 8 6 8 ) ▁was ▁an ▁Irish ▁peer , ▁sty led ▁Earl ▁of ▁Hills borough ▁until ▁ 1 8 4 5 . ▁ ▁The ▁el dest ▁son ▁of ▁Arthur ▁Hill , ▁ 3 rd ▁Mar qu ess ▁of ▁Down shire , ▁Hills borough ▁was ▁educated ▁at ▁E ton ▁and ▁Christ ▁Church , ▁Oxford . ▁He ▁was ▁commission ed ▁an ▁en sign ▁in ▁the ▁Royal ▁South ▁Down ▁Milit ia , ▁of ▁which ▁his ▁father ▁was ▁colon el , ▁on ▁ 4 ▁June , ▁and ▁was ▁commission ed ▁lieutenant - col onel ▁in ▁the ▁same ▁on ▁ 1 0 ▁September . ▁ ▁He ▁was ▁appointed ▁Sher iff ▁of ▁County ▁Down ▁for ▁ 1 8 3 4 . ▁From ▁ 1 8 3 6 ▁until ▁ 1 8 4 5 , ▁he ▁represented ▁Down ▁in ▁Parliament , ▁and ▁was ▁a ▁justice ▁of ▁the ▁peace ▁for ▁the ▁county ▁as ▁well . ▁ ▁On ▁ 2 3 ▁August ▁ 1 8 3 7 , ▁he ▁married ▁Hon . ▁Caroline ▁Frances ▁St ap leton ▁Cot ton , ▁the ▁el dest ▁daughter ▁of ▁St ap leton ▁Cot ton , ▁ 1 st ▁Vis count ▁Com ber m ere . ▁They ▁had ▁four ▁children : ▁Arthur ▁Hill , ▁Vis count ▁Kil war lin ▁( 1 0 ▁June ▁ 1 8 4 1 ▁– ▁ 2 8 ▁June ▁ 1 8 4 1 ) ▁Lady ▁Alice ▁Maria ▁Hill ▁( 7 ▁November ▁ 1 8 4 2 ▁– ▁ 2 5 ▁February ▁ 1 9 2 8 ), ▁married ▁Thomas ▁T