quality:correction, information:classification
In Europe

Sasanian culture and military structure had a significant influence on Roman civilization. The structure and character of the Roman army was affected by the methods of Persian warfare. In a modified form, the Roman Imperial autocracy imitated the royal ceremonies of the Sasanian court at Ctesiphon, and those in turn had an influence on the ceremonial traditions of the courts of medieval and modern Europe. The origin of the formalities of European diplomacy is attributed to the diplomatic relations between the Persian governments and the Roman Empire.