<prompt> Translate the following text to EnglishSala del Mappamondo, iliyochorwa na Ambrogio Lorenzetti, ina picha mbili za mchoro za mchoro za mchoro wa mchoro wa mchoro wa mchoro wa mchoro wa mchoro wa mchoro wa mchoro wa mchoro wa mchoro wa mchoro wa mchoro wa mchoro wa mchoro wa mchoro.  <response>: The Sala del Mappamondo named after a lost map of the Sienese world painted by Ambrogio Lorenzetti to trace the citys international banking interests has two great frescoes by the Siena-born master Simone Martini. 