Persian Empire

Collocation of 'Persian' (as a demonym of Latinate Persia in the sense of Greek Persis, Old Persian Pārsa) and 'empire'. Translates Latin Imperium Persārum, as attested e.g. in the 1st century (e.g. Quintus Curtius Rufus "Life and exploits of Alexander the Great" 3.3.8).

In English from the 17th century[1][2], invariably in reference to the Achaemenid Empire (550–330 B.C.E.) conquered by Alexander the Great. Sometimes expanded to Medo-Persian Empire[3] (translating Imperium Persārum et Mēdōrum, "empire of (ruled by) Persians and Medians"). The 'et Medorum' is not a reference to Median empire (625–550 B.C.E.), but rather to (1) the tribal affiliation and shared status of the Persians and Medians, (2) the mixed Persian-Median parentage of the founder of the dynasty, Cyrus I.

The term 'Persian empire' has sometimes been extended to the later, "restored" empire ruled by the Sasanian dynasty[4][5][6], the ruling dynasty of which was also from Persia in the sense of Greek Persis, Old Persian Pārsa. It is sometimes taken more loosely to refer to the Achaemenid, Parthian and Sasanian states taken together (so Encyclopædia Britannica 2009: "historical empire from about 550 B.C.E. – 640 C.E.").

the Persian Empire (historical)

1. The empire ruled by the Achaemenid dynasty 550–330 B.C.E.

   Synonyms: Persia, Achaemenid Empire, First Persian Empire

   • 1652, Thomas Fuller, Holy and Profane State, page 140:

     We know how Darius got the Persian Empire from the rest of his fellow Peers, from the first neighing of his generous Steed.

2. The empire ruled by the Sasanian dynasty 224–651 C.E.

   Synonyms: Persia, Sasanian Empire, Second Persian Empire, Neo-Persian Empire

   • 1880, George Rawlinson, A manual of ancient history, from the earliest times to the fall of the Sassanian empire, page 569:

     The geographical limits of the Sassanian or Later Persian Empire were so nearly identical with those of its predecessor, the Parthian, […]

• Persia