▁Al ready ▁in ▁the ▁mid - 9 th ▁century , ▁on ▁the ▁T arn ów ' s ▁St . ▁Martin ▁Mount ▁( G ó ra ▁sw . ▁Marc ina , ▁ 2 . 5 ▁kilom eters ▁from ▁the ▁centre ▁of ▁today ' s ▁city ), ▁a ▁S lav ic ▁g ord ▁was ▁established , ▁probably ▁by ▁the ▁V ist ul ans . ▁Due ▁to ▁efforts ▁of ▁local ▁arch ae olog ists , ▁we ▁know ▁that ▁the ▁size ▁of ▁the ▁g ord ▁was ▁almost ▁ 1 6 ▁hect ares , ▁and ▁it ▁was ▁surrounded ▁by ▁a ▁r amp art . ▁The ▁settlement ▁was ▁probably ▁destroyed ▁in ▁the ▁ 1 0 3 0 s ▁or ▁the ▁ 1 0 5 0 s , ▁during ▁either ▁a ▁popular ▁re bell ion ▁against ▁Christian ity ▁( see ▁Bapt ism ▁of ▁Poland ), ▁or ▁Czech ▁invasion ▁of ▁L esser ▁Poland . ▁In ▁the ▁mid - 1 1 th ▁century , ▁a ▁new ▁g ord ▁was ▁established ▁on ▁the ▁B iała ▁river . ▁It ▁was ▁a ▁royal ▁property , ▁which ▁in ▁the ▁late ▁ 1 1 th ▁or ▁early ▁ 1 2 th ▁century ▁was ▁handed ▁over ▁to ▁the ▁T yn iec ▁Bened ict ine ▁Ab bey . ▁The ▁name ▁T arn ów , ▁with ▁a ▁different ▁sp elling , ▁was ▁for ▁the ▁first ▁time ▁mentioned ▁in ▁a ▁document ▁of ▁Pap al ▁leg ate , ▁Card inal ▁G illes ▁de ▁Paris ▁( 1 1 2 4 ). ▁ ▁The ▁first ▁documented ▁mention ▁of ▁T arn ów ▁occurs ▁in ▁the