▁Grand ▁Duke ▁became ▁dependent ▁on ▁powerful ▁land own ers , ▁who ▁began ▁demand ing ▁greater ▁libert ies ▁and ▁privileges . ▁The ▁nobles ▁were ▁granted ▁administrative ▁and ▁jud icial ▁power ▁in ▁their ▁domains ▁and ▁increasing ▁rights ▁in ▁state ▁politics . ▁The ▁legal ▁status ▁of ▁the ▁nob ility ▁was ▁based ▁on ▁several ▁privileges , ▁granted ▁by ▁the ▁Grand ▁D uk es : ▁▁ ▁In ▁ 1 3 8 7 ▁the ▁Grand ▁Duke ▁of ▁Lith u ania , ▁J og ail a , ▁newly ▁crown ed ▁King ▁of ▁Poland , ▁granted ▁a ▁privile ge ▁to ▁nobles ▁and ▁soldiers . ▁They ▁received ▁personal ▁rights , ▁including ▁the ▁right ▁to ▁inherit ▁and ▁govern ▁land ▁as ▁well ▁as ▁est ates ▁inherited ▁from ▁ancest ors ▁or ▁gift ed ▁by ▁the ▁Grand ▁Duke . ▁At ▁the ▁same ▁time , ▁the ▁nobles ▁had ▁duties ▁to ▁serve ▁in ▁the ▁military , ▁build , ▁maintain ▁and ▁saf egu ard ▁cast les , ▁brid ges , ▁roads ▁and ▁other ▁vic in ities . ▁ ▁In ▁ 1 4 1 3 ▁V y ta ut as ▁and ▁J og ail a ▁signed ▁Union ▁of ▁Hor od ło . ▁The ▁act ▁served ▁to ▁renew ▁Polish – L ith uan ian ▁union ▁and ▁establish ▁a ▁common ▁Se jm , ▁guarantee ing ▁the ▁right ▁to ▁inherit ▁lands ▁gift ed ▁by ▁the ▁Grand ▁Duke . ▁Fort y - three ▁Lith uan ian ▁noble ▁families ▁were ▁granted ▁Polish ▁co ats ▁of ▁arms . ▁Most ▁of ▁the ▁v eld am ai ▁became ▁ser fs . ▁ ▁J og ail a ' s