▁destroyed ▁in ▁reven ge , ▁because ▁of ▁the ▁Christian ▁cl ash ▁against ▁Muslim s ▁in ▁the ▁city . ▁Ö z ▁Beg ▁was ▁friendly ▁towards ▁the ▁Pope ▁and ▁ex changed ▁letters ▁and ▁g ifts . ▁Khan ▁Ö z ▁Beg ▁signed ▁a ▁new ▁trade ▁treat y ▁with ▁the ▁Gen o ese ▁in ▁ 1 3 3 9 ▁and ▁allowed ▁them ▁to ▁re build ▁the ▁walls ▁of ▁C aff a . ▁In ▁ 1 3 3 2 ▁he ▁had ▁allowed ▁the ▁Ven et ians ▁to ▁establish ▁a ▁col ony ▁at ▁T ana is ▁on ▁the ▁Don . ▁ ▁New ▁Sar ai ▁▁ ▁During ▁the ▁reign ▁of ▁Ö z ▁Beg , ▁Sar ai ▁( liter ally ▁meaning ▁" pal ace " ▁in ▁Pers ian ▁and ▁Turkish ) ▁was ▁more ▁quickly ▁becoming ▁a ▁main ▁commercial ▁center ▁and ▁industrial ▁trad ing ▁center ▁of ▁the ▁country ▁rather ▁than ▁just ▁a ▁political ▁center . ▁The ▁expression ▁of ▁Mong ol ▁camp ▁ment ality , ▁following ▁Ash ▁and ▁the ▁nearby ▁absence ▁of ▁some ▁structures . ▁ ▁To ▁successfully ▁spread ▁Islam , ▁it ▁was ▁necessary ▁to ▁build ▁a ▁mos que ▁and ▁other ▁" el abor ate ▁places " ▁like ▁bath s , ▁an ▁important ▁element ▁of ▁Muslim ▁culture . ▁Sar ai ▁attract ed ▁mer ch ants ▁from ▁European , ▁Asian ▁and ▁Islam ic ▁countries ▁as ▁well ▁as ▁Middle ▁East . ▁S lave ▁trade ▁fl our ished ▁due ▁to ▁strength ening ▁t ies ▁with ▁M aml uk ▁Sultan ate . ▁Success ful ▁commercial ▁revolution s ▁require ▁new ▁mark ets ▁and ▁car av ans : ▁"