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Reference.org
Immortals (Sasanian Empire)
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<p>The Immortals was an elite cavalry unit of the <a href="/facts/Sasanian_army/CShIVckr">army</a> of the <a href="/facts/Sasanian_Empire/JvbRevkA">Sasanian Empire</a> with the alleged size of 10,000 men, similar to the <a href="/facts/Achaemenid_Empire/avlzWxF0">Achaemenid</a> "<a href="/facts/Immortals_(Achaemenid_Empire)/0Eno4270">Immortals</a>" described by Herodotus. The name is derived from a term used by <a href="/facts/Roman_Empire/l4E1aUuV">Roman</a> historians to refer to the unit. Armenian and Islamic sources also have allusions to elite unit(s) in the <a href="/facts/Military_of_the_Sasanian_Empire/CShIVckr">Sasanian army</a>. </p>