0 . ▁ ▁In ▁the ▁Middle ▁A ges , ▁S lav ic ▁trib al ▁conf ed era cies , ▁and ▁then ▁S lav ic ▁states , ▁domin ated . ▁S iles ia ▁was ▁part ▁of ▁Great ▁Mor avia , ▁then ▁Kingdom ▁of ▁Boh emia ▁and ▁finally ▁the ▁Pi ast ▁mon archy ▁of ▁Poland . ▁The ▁trib al ▁differences ▁started ▁to ▁disappear ▁after ▁the ▁cons olid ation ▁of ▁Poland ▁in ▁the ▁ 1 0 th ▁and ▁ 1 1 th ▁centuries . ▁The ▁main ▁factors ▁of ▁this ▁process ▁were ▁the ▁establishment ▁of ▁a ▁single ▁mon archy ▁that ▁ruled ▁over ▁all ▁Polish ▁tribes , ▁as ▁well ▁as ▁creation ▁of ▁a ▁separate ▁ecc les iast ical ▁organization ▁within ▁the ▁boundaries ▁of ▁the ▁newly ▁established ▁Polish ▁state . ▁The ▁names ▁of ▁the ▁smaller ▁tribes ▁disappeared ▁from ▁historical ▁records , ▁as ▁well ▁as ▁the ▁names ▁of ▁some ▁prominent ▁tribes . ▁However , ▁in ▁some ▁places , ▁the ▁names ▁of ▁the ▁most ▁important ▁tribes ▁transformed ▁into ▁names ▁representing ▁the ▁whole ▁region , ▁such ▁as ▁Maz ov ians ▁for ▁Maz ov ia , ▁and ▁S iles ians ▁for ▁S iles ia . ▁As ▁a ▁result ▁of ▁the ▁fragment ation ▁of ▁Poland , ▁some ▁of ▁those ▁regions ▁were ▁again ▁divided ▁into ▁smaller ▁entities , ▁such ▁as ▁the ▁division ▁of ▁S iles ia ▁into ▁Lower ▁S iles ia ▁and ▁Upper ▁S iles ia ). ▁However , ▁the ▁trib al ▁era ▁was ▁already ▁over , ▁and ▁these ▁divisions ▁reflected ▁only ▁political ▁sub div isions ▁of ▁the ▁Polish ▁real m . ▁Within ▁Poland ,