<prompt> Translate the following text to EnglishJengo hilo lilijengwa mwaka 1554 wakati Mfalme Charles wa Tano wa Roma Takatifu alipotoa amri ya kujenga upya ukuta huo wenye unene wa mita 31.2.  <response>: The present bulwarks date back to the year 1554, when Charles V, Holy Roman emperor, ordered that the 31.2-metre-thick 6-foot wall be reconstructed. 