The surviving chronicles, compiled generations after the events by dynasties hostile to the Nizaris, report figures for distinct episodes (assassinated officials, massacred communities, one city's casualties) rather than a single reconciled total, and modern historians including Lewis and Daftary have not synthesized them into an agreed toll for the century-long conflict.
What would resolve this A systematic cross-check of the Persian chronicle tradition against surviving documentary and archaeological evidence from the Nizari strongholds and the Seljuk provinces, of the kind that could distinguish which reported episodes are independently corroborated from which are hostile chronicle embellishment.
OpenMedieval Islamic history; Persian and Arabic chronicle source criticismFarhad Daftary, The Assassin Legends: Myths of the Ismailis