dom . ▁ ▁Although ▁most ▁ser fs ▁were ▁from ▁western ▁Ukrain ian ▁lands , ▁a ▁significant ▁number ▁of ▁Polish ▁ser fs ▁from ▁central ▁Poland ▁also ▁settled ▁these ▁est ates . ▁ ▁The ▁latter ▁t ended ▁to ▁assim il ate ▁into ▁Ukrain ian ▁society ▁and ▁some ▁of ▁them ▁even ▁took ▁part ▁in ▁C oss ack ▁u pr is ings ▁against ▁the ▁land l ords . ▁Polish ▁magn ates ▁from ▁Ukraine , ▁such ▁as ▁members ▁of ▁the ▁family ▁Pot ock i ▁and ▁Z olk iew ski , ▁played ▁a ▁significant ▁political ▁and ▁social ▁role ▁within ▁the ▁Polish - L ith uan ian ▁Commonwealth , ▁as ▁did ▁Pol on ized ▁native ▁magn ates ▁such ▁as ▁the ▁family ▁Wis ni owie cki . ▁ ▁They ▁were ▁amongst ▁the ▁wealth iest ▁nobles ▁in ▁Poland ; ▁the ▁Wis ni owie cki ▁estate ▁included ▁ 3 8 , 0 0 0 ▁households ▁with ▁a ▁population ▁of ▁ 2 3 0 , 0 0 0 ▁subjects . ▁ ▁Polish ▁rule ▁involved ▁expansion ▁of ▁Jes uit ▁schools ▁and ▁large ▁scale ▁construction ▁or ▁orn ate ▁cast les ▁and ▁est ates ▁that ▁included ▁libraries , ▁art ▁collections ▁and ▁arch ives ▁that ▁in ▁many ▁cases ▁were ▁the ▁equal ▁in ▁importance ▁to ▁those ▁in ▁Poland ▁itself . ▁ ▁Prom inent ▁Pol es ▁from ▁lands ▁that ▁are ▁currently ▁Ukraine ▁include ▁the ▁historian ▁and ▁poet ▁Jó zef ▁Bart ł om iej ▁Z im or ow ic , ▁Polish ▁bar o que ▁poet ▁Kas per ▁T ward owski , ▁and ▁Roman ▁Catholic ▁Bishop ▁of ▁K iev , ▁as ▁well