co . ▁ ▁The ▁S lav ic ▁g ord ▁of ▁N os id l sk ▁was ▁first ▁mentioned ▁in ▁ 1 0 6 5 , ▁in ▁the ▁so - called ▁M og il no ▁F als ification ▁of ▁King ▁B oles ław ▁II ▁the ▁Gener ous ▁for ▁the ▁Bened ict ine ▁Ab bey ▁at ▁M og il no . ▁As ▁the ▁document ▁stated , ▁the ▁g ord ▁of ▁N os id l sk ▁was ▁an ▁important ▁center ▁of ▁defence , ▁trade ▁and ▁administration . ▁In ▁ 1 1 5 5 , ▁a ▁document ▁issued ▁for ▁Duke ▁B oles law ▁K ed z ier za wy ▁confirmed ▁the ▁existence ▁of ▁the ▁g ord ▁at ▁Nas iel sk , ▁stating ▁that ▁Now a ▁Wies ▁near ▁Nas iel sk ▁was ▁granted ▁to ▁the ▁ab bey ▁of ▁C zer wi ń sk ▁nad ▁Wis łą . ▁In ▁ 1 2 5 7 , ▁Duke ▁of ▁S iem ow it ▁I ▁of ▁Mas ov ia ▁granted ▁one - third ▁of ▁Nas iel sk ▁to ▁the ▁C zer win sk ▁Ab bey . ▁ ▁By ▁the ▁late ▁ 1 3 th ▁century , ▁Nas iel sk ▁emer ged ▁as ▁the ▁seat ▁of ▁a ▁cast ell any . ▁First ▁document ▁that ▁confir ms ▁this ▁fact ▁was ▁issued ▁in ▁ 1 2 9 7 , ▁with ▁the ▁notice ▁of ▁„ comes ▁Thomas ▁cast ellan us ▁de ▁N os yl k ”. ▁On ▁November ▁ 1 1 , ▁ 1 3 8 6 , ▁Jan usz ▁I ▁of ▁Wars aw ▁granted ▁the