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Security Dialogue 2026

12 March 2026, Nairobi, Kenya

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THE FIVE GENERATIONS OF TERRORISM: From the Sicarii and the Assassins to ISIS and the Religio-Political Present

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60 min read

Intro:

This policy research paper proposes a five-generation framework for the study of terrorism that begins in antiquity rather than in the late nineteenth century. Generations are treated here not as a settled periodization but as an analytical device for tracing transformations in motive, organization, political purpose, and operational environment across more than two millennia of ideologically legitimized violence.

The first generation is localized ideological violence, illustrated by the Sicarii of first-century Judea and the Azariqa faction of the early Kharijites. The second is medieval religious-political violence and institutionalized asymmetry, exemplified by the Hashashins, or Assassins, of Persia and Syria. The third is imperial, colonial terrorism, and anti-colonial terror, in which violence from above and violence from below become structurally paired. The fourth is the modern religious wave of transnational mobilization associated with the late twentieth century. The fifth, the article’s principal claim, is a religio-political, networked, and increasingly autonomous era, distinguished not by religion as such but by a feedback loop in which theology, political strategy, local grievance, organizational self-financing, territorial influence, and digital communication reinforce one another.

The paper distinguishes terrorism from the act of terror, extremism, violent extremism, and radicalism, and argues that counterterrorism fails when it treats this spectrum as a single security problem. The policy implication follows: the decisive task is no longer only to defeat organizations, but to prevent violent actors from acquiring the political, economic, social, and cognitive conditions of alternative authority.

The views expressed are those of the author and do not necessarily reflect those of the HORN Institute.

The HORN International Institute for Strategic Studies is a non-profit, applied research and policy think-do tank focusing on research and providing evidence-based analysis and strategic interventions to address political, security, economic, and environmental challenges affecting the greater Horn of Africa region.

© 2026 by The HORN International Institute for Strategic Studies. All rights reserved.

Author

Mustafa Y. Ali, Ph.D.

Director of Arigatou International – Nairobi &Secretary General of the Global Network of Religions for Children (GNRC)

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