em ys l id ▁prince ▁Kon rad ▁( b . ▁ 1 1 5 8 / 6 8 ▁– ▁d . ▁ 5 ▁July ▁ 1 1 7 5 / 1 1 9 0 ) ▁Jan ▁( b . ▁ 1 1 6 1 / 6 9 ▁– ▁d . ▁bef . ▁ 1 0 ▁March ▁ 1 1 7 4 ) ▁Bert a ▁( b . ▁ca ▁ 1 1 6 7 ▁– ▁d . ▁ 7 ▁May ▁a ft . ▁ 1 2 0 0 ?) ▁Henry ▁I ▁the ▁Be arded ▁( b . ▁ 1 1 6 5 / 7 0 ▁– ▁d . ▁K ros no ▁Od rz ans ke , ▁ 1 9 ▁March ▁ 1 2 3 8 ) ▁W ład ys ław ▁( b . ▁a ft . ▁ 1 1 8 0 ▁– ▁d . ▁ 4 ▁June ▁bef . ▁ 1 1 9 9 ) ▁ ▁Cont ro vers ies ▁In ▁German ▁and ▁Polish ▁histor i ography ▁there ▁exists ▁a ▁controvers y ▁about ▁the ▁relations ▁between ▁S iles ia ▁and ▁the ▁Holy ▁Roman ▁Empire ▁in ▁the ▁early ▁medieval ▁period . ▁According ▁to ▁some ▁German ▁histor ians ▁the ▁date ▁of ▁ 1 1 6 3 , ▁when ▁B oles ław ▁and ▁his ▁brothers ▁were ▁allowed ▁to ▁return ▁to ▁S iles ia , ▁is ▁considered ▁to ▁be ▁the ▁moment ▁when ▁S iles ia ▁separated ▁from ▁Poland ▁and ▁became ▁part ▁of ▁the ▁Holy ▁Roman ▁Empire . ▁ ▁On ▁the ▁other ▁hand , ▁Polish ▁histor ians ▁claim ▁that