Medain, "the twin city," combined in one, under this Arabic
name, the two contiguous Persian capitals, Seleucia and
Ctesiphon. The name Medain signifies "cities," and "it is said
to have comprised a cluster of seven towns, but it is
ordinarily taken to designate the twin cities of Seleucia and
Ctesiphon."
_Sir W. Muir,
Annals of the Early Caliphate,
chapters 10 and 17._
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