Causes of the survival of the Roman Empire in the East.--Survey of Byzantine history.--The Constitution of the later Roman Empire.--Roman emperors from Basil II to Isaac Komnenos.

Fatal error: Uncaught TypeError: join(): Argument #2 ($array) must be of type ?array, string given in /var/www/pawtucket/themes/hellenic/printTemplates/summary/ca_objects_summary.php:245 Stack trace: #0 /var/www/pawtucket/themes/hellenic/printTemplates/summary/ca_objects_summary.php(245): join(Array, ', ') #1 /var/www/pawtucket/app/lib/View.php(329): require('/var/www/pawtuc...') #2 /var/www/pawtucket/app/lib/View.php(203): View->_render('/var/www/html/t...') #3 /var/www/pawtucket/app/lib/View.php(253): View->compile('/var/www/html/t...', false, NULL) #4 /var/www/pawtucket/app/helpers/displayHelpers.php(4980): View->getTagList('/var/www/html/t...') #5 /var/www/pawtucket/app/helpers/exportHelpers.php(201): caDoTemplateTagSubstitution(Object(View), Object(ca_objects), '/var/www/html/t...', Array) #6 /var/www/pawtucket/app/controllers/DetailController.php(168): caExportItemAsPDF(Object(RequestHTTP), Object(ca_objects), '_pdf_ca_objects...', 'DF0591.B81974 s...', Array) #7 /var/www/pawtucket/app/lib/Controller/RequestDispatcher.php(289): DetailController->__call('objects', Array) #8 /var/www/pawtucket/app/lib/Controller/AppController.php(108): RequestDispatcher->dispatch(Array) #9 /var/www/pawtucket/index.php(134): AppController->dispatch(true) #10 {main} thrown in /var/www/pawtucket/themes/hellenic/printTemplates/summary/ca_objects_summary.php on line 245