▁both ▁the ▁Pe er age ▁of ▁Ireland ▁and ▁the ▁Pe er age ▁of ▁Great ▁Britain ▁held ▁by ▁the ▁head ▁of ▁the ▁Fitz will iam ▁family ▁( l ater ▁W ent worth - F itz will iam ). ▁ ▁History ▁The ▁Fitz will iams ▁acquired ▁extensive ▁hold ings ▁in ▁the ▁south ▁of ▁the ▁West ▁R iding ▁of ▁York shire , ▁largely ▁through ▁strateg ic ▁mar ital ▁al li ances . ▁In ▁ 1 4 1 0 , ▁Sir ▁John ▁Fitz will iam ▁of ▁S pro t borough , ▁who ▁died ▁in ▁ 1 4 2 1 , ▁married ▁Margaret ▁Cla rell , ▁daughter ▁of ▁Thomas ▁Cla rell ▁of ▁Ald w ark , ▁the ▁desc endant ▁of ▁a ▁major ▁Norman ▁land hold ing ▁family . ▁This ▁is ▁how ▁the ▁Fitz will iams ▁acquired ▁the ▁Cla rell ▁hold ings . ▁ ▁Sir ▁William ▁Fitz will iam ▁( – 1 5 3 4 ) ▁was ▁an ▁Ald erman ▁and ▁Sher iff ▁of ▁London ▁and ▁acquired ▁the ▁Mil ton ▁Hall ▁estate ▁in ▁Peter borough ▁in ▁ 1 5 0 2 . ▁His ▁grand son ▁Sir ▁William ▁Fitz will iam ▁served ▁as ▁Lord ▁Deput y ▁of ▁Ireland ▁from ▁ 1 5 7 1 ▁to ▁ 1 5 7 5 ▁and ▁from ▁ 1 5 8 8 ▁to ▁ 1 5 9 4 ; ▁he ▁super vised ▁the ▁execution ▁of ▁the ▁death ▁sentence ▁on ▁Mary , ▁Queen ▁of ▁Sc ots . ▁ ▁Bar ons ▁Fitz will iam ▁His ▁grand son ▁William ▁Fitz will iam ▁( d . ▁ 1 6