This period was a time of relative peace in Alamut, during which the Imam's mother seems to have deposed many incapable governors in Rudhbar and Kohistan, possibly due to suspicions that they had misused their powers.

In an attempt to cover up their wrongdoings, possibly including defalcation[citation needed], some of the governors spread rumors against the Imam, claiming that a physician's operation a few months before the death of his mother had damaged his brain and caused excessive blood loss.

One of the da’is, Shams Alden Ibn Ahmad Ibn Yaqoub Altaibi (شمس الدين بن أحمد بن يعقوب الطيبي), documented that the treatise named The Constitution and the Call to the Believers to attendance (الدستور و دعوة المؤمنين إلى الحضور) was delivered to him by Da’i Nasir al Din al Tusi, who obtained it directly from Ala’ ad-Din Muhammad.

[13] More recent studies have revealed that intellectual life flourished during the long reign of Alāʾ al-Din Muhammad and was bolstered by an influx of outside scholars who fled the first waves of Mongol invasions and found refuge in the Nizari fortress communities of Persia.

Purely local squabbles were replaced by ambitious diplomatic activities in lands as far away as Europe and Mongolia, while a Nizari religious mission was firmly established in India.

[14] Besides his missions to create a Christian–Muslim coalition in anticipation of the Mongols' invasion, Alāʾ al-Din Muhammad was among the first to send peaceful messages to the Great Khan Guyuk in Mongolia in full collaboration with the Sunni Abbasid Caliphate.

[14] Maymūn-Diz (Persian: میمون دز‎) was a major castle with a unique construction style built during the reign of Alāʾ ad-Dīn Muḥammad on a high rock with a sharp cliff.

[15] There is academic evidence that many citations about Alāʾ ad-Dīn Muḥammad reflect the religious bias of Atâ-Malek Juvayni,[17] who alleged that his rule was described as "cruel, imperious, sadistic, alcoholic, and unpredictable".

[19] Marco Polo's fantastical description of Alāʾ al-Din Muhammad III, the penultimate Lord of the Alamut, was copied by other European writers without verification; though it caught the imagination of many readers, it lacked historical authenticity.

The contemporary historian al-Juwayni—an avowed enemy of the Nizaris who accompanied the Mongol leader Hulegu to Alamut in 1256 and carefully inspected the fortress before its destruction—does not report discovering any "secret gardens of paradise" as claimed in Polo's popular account.