George Rawlinson 
History of the Sasanian Empire [EPUB ebook] 
The Annals of the New Persian Empire

The Sasanian Empire or Neo-Persian Empire, was the last period of the Persian Empire before the rise of Islam. It was named after the House of Sasan who ruled from 224 to 651 AD. The Sasanian Empire, which succeeded the Parthian Empire, was recognized as one of the leading world powers alongside its neighboring arch-rival the Byzantine Empire, for a period of more than 400 years.