Rubuta ci gaba ga wannan sakin layi - A cikin 642, yayin mamayar Larabawa na Iran, sanannen yaƙi
aka yi a Nahavand. Tare da asara mai yawa a ɓangarorin biyu, a ƙarshe ya haifar da shan kashi na Sasanian, kuma a matsayin irin wannan, ya buɗe ƙofofin tsaunukan Iran ga masu mamaye. A farkon zamanin Islama, Nahavand ya bunƙasa a matsayin wani ɓangare na lardin Jibal. Da farko ya yi aiki a matsayin cibiyar gudanarwa na gundumar Mah al-Basra ("Media of the Basrans"). An bayar da rahoton cewa an yi amfani da kudaden shiga don biyan sojojin daga Basra da aka ajiye a Nahavand. Masana ilimin ƙasa na tsakiyar zamanai sun ambaci Nahavand a matsayin cibiyar kasuwanci mai wadata tare da masallatai biyu na Juma'a. Lokacin da matafiyin Larabawa na ƙarni na 10 Abu Dulaf ya yi tafiya ta Nahavand ya lura da "kyakkyawan ragowar Farisawa [na dā]". Abu Dulaf ya kuma rubuta cewa a lokacin mulkin Caliph al-Ma'mun (813<unk>833), an sami ɗakin ajiya, wanda ke dauke da akwatunan zinariya guda biyu.