The factual accuracy of this flag is disputed. Reddit isn't a reliable source and the post doesn't give any supporting evidence. The author claims that the banner was the same carried by Muhammad, but in islamic tradition it was black not green.
Kopsavilkums
This flag is fictitious, proposed or locally used unofficially but not adopted. It may be named as it would be as an official flag of a geographical or other entity and have some visual elements that are similar to official logos or flags of that entity, but it is not official and doesn't have any official recognition. Under any circumstances whatsoever, you should not add these flags in any articles, unless it is proposed by a government agency or it is covered by the media or if the flag is locally used.
AprakstsRashidun Flag.svg
English: fictional Flag of Rashidun Caliphate (631-661)
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