▁from ▁ 1 1 7 7 ▁on ward , ▁S iles ia ▁was ▁divided ▁into ▁many ▁smaller ▁duch ies . ▁In ▁ 1 1 7 8 , ▁parts ▁of ▁the ▁Duch y ▁of ▁Krak ów ▁around ▁By tom , ▁O ś wię c im , ▁Ch rz an ów ▁and ▁S iew ierz ▁were ▁transferred ▁to ▁the ▁S iles ian ▁Pi asts , ▁although ▁their ▁population ▁was ▁of ▁V ist ul an ▁and ▁not ▁of ▁S iles ian ▁descent . ▁Part s ▁of ▁those ▁territ ories ▁were ▁bought ▁by ▁the ▁Polish ▁k ings ▁in ▁the ▁second ▁half ▁of ▁the ▁ 1 5 th ▁century , ▁but ▁the ▁By tom ▁area ▁remained ▁in ▁the ▁possession ▁of ▁the ▁S iles ian ▁Pi asts , ▁even ▁though ▁it ▁remained ▁a ▁part ▁of ▁the ▁Dioc ese ▁of ▁Krak ów . ▁Between ▁ 1 3 2 7 ▁and ▁ 1 3 4 8 , ▁duch ies ▁of ▁S iles ia ▁came ▁under ▁su zer ain ty ▁of ▁the ▁Crown ▁of ▁Boh emia , ▁and ▁was ▁then ▁passed ▁to ▁the ▁H abs burg ▁Mon archy ▁of ▁Austria ▁in ▁ 1 5 2 6 . ▁ ▁Begin ning ▁in ▁the ▁ 1 3 th ▁century , ▁S lav ic ▁S iles ia ▁began ▁to ▁be ▁settled ▁by ▁Germ ans ▁from ▁various ▁parts ▁of ▁Germany , ▁including ▁Pr uss ia ▁and ▁Austria . ▁This ▁led ▁to ▁changes ▁in ▁the ▁eth nic ▁structure ▁of ▁the ▁province . ▁In ▁the ▁Middle ▁A ges , ▁various ▁German ▁dialect s ▁of ▁the ▁new ▁sett lers