Originally posted by: piasabird
Achaemenid Empire - King Xerxes i.e. Invasion of Greece and Turkey.
This may not be considered Muslim.
20 August?) A.D. 570 is the estimated birth of the Prophet Mohammed.
The Height of power for Xerxes is around 500 BC, so the term Muslim was not used until after Mohammed around 600 AD.
Please Excuse me if I spelled any names incorrectly.
At one time, almost all of north Africa and part of Spain was in their hands all under one empire.
the archaemenid empire was not muslim. in fact, it was around 1000 years prior to islam's founding. iirc it was zoroastrian.
the largest muslim empire was at the height of the osmanli empire, which was in 1683. they started declining from that point on (austrians and russians were coming on in the north, egypt and algeria becoming essentially independent and then under french and british rule, etc.)
the mongol empire was large, but it wasn't muslim. though the osmanlis may have descended from the mongols. the most famous of the mongols descendants, however, was tamerlane (who was muslim, but was denounced as an enemy of islam by the osmanli sultan, who had taken over the role of caliph). he had a very big empire.