7 1 4 ▁BC ▁he ▁inv aded ▁the ▁city ▁of ▁U hl u ▁lying ▁in ▁the ▁north west ▁of ▁U room i ye ▁lake ▁that ▁lay ▁in ▁the ▁territory ▁of ▁Ur art u ▁emp ire , ▁and ▁then ▁he ▁noticed ▁that ▁the ▁occupied ▁area ▁enjoyed ▁a ▁very ▁rich ▁veget ation ▁even ▁though ▁there ▁was ▁no ▁river ▁running ▁across ▁it . ▁So ▁he ▁managed ▁to ▁discover ▁the ▁reason ▁why ▁the ▁area ▁could ▁stay ▁green , ▁and ▁realized ▁that ▁there ▁were ▁some ▁q an ats ▁behind ▁the ▁matter . ▁In ▁fact ▁it ▁was ▁Urs a , ▁the ▁king ▁of ▁the ▁region , ▁who ▁had ▁res cu ed ▁the ▁people ▁from ▁th irst ▁and ▁turned ▁U hl u ▁into ▁a ▁prosper ous ▁and ▁green ▁land . ▁G ob lot ▁bel ieves ▁that ▁the ▁influence ▁of ▁the ▁M ede ans ▁and ▁A cha emen ids ▁made ▁the ▁technology ▁of ▁q an at ▁spread ▁from ▁Ur art u ▁( in ▁the ▁western ▁north ▁of ▁Iran ▁and ▁near ▁the ▁present ▁border ▁between ▁Iran ▁and ▁Turkey ) ▁to ▁all ▁over ▁the ▁Iran ian ▁plate au . ▁▁ ▁It ▁was ▁an ▁A cha emen id ▁r uling ▁that ▁in ▁case ▁someone ▁succeeded ▁in ▁construct ing ▁a ▁q an at ▁and ▁bringing ▁ground water ▁to ▁the ▁surface ▁in ▁order ▁to ▁cultiv ate ▁land , ▁or ▁in ▁renov ating ▁an ▁abandoned ▁q an at , ▁the ▁tax ▁he ▁was ▁supposed ▁to ▁pay ▁the ▁government ▁would ▁be ▁wa ived ▁not ▁only ▁for ▁him ▁but ▁also ▁for ▁his ▁success ors ▁for ▁up ▁to ▁ 5