Lesson 9: Population Movements, Expansion, and Integration in Ethiopia
Video Lesson
Lesson Objectives
At the end of this lesson, learners will be able to:
- explain the causes and consequences of population movement in Ethiopia andthe Horn.
- describe the Oromo Gadaa system.
Brainstorming Questions
- List some of the peoples and states in southern and central Ethiopian region during the period.
- What do you know about the Gadaa System?
Key Terms
- population
- movement
- expansion
- confederacy
The people who inhabit a territory or state
A change of position that does not entail a change of location
The act of increasing (something) in size, volume, quantity or scope
A union of political organizations
1. Overview of Population Movements and Expansion
Ethiopia and the Horn of Africa have historically experienced significant population movements and expansions due to a combination of military conflicts, demographic pressures, and environmental factors. Key groups involved include the Afar, Oromo, Somali, and Argoba, among others. These movements were influenced by conflicts between the Christian kingdoms and Muslim sultanates, as well as pressures on resources and trade routes.
2. Population Movements and Conflicts (Late 15th to Early 16th Century)
Military Conflicts: The conflicts between the Christian kingdoms and the Sultanate of Adal in the late 15th and early 16th centuries led to considerable population movements. The military confrontations disrupted trade routes and prompted migrations among various ethnic groups such as the Argoba, Afar, and Somali. Demographic Pressure: Increasing populations and environmental stresses also contributed to these movements, as people sought new territories for settlement and resources.
3. The Argoba
Role and Influence: The Argoba were significant agents in the expansion of Islam and the formation of Muslim states in the Horn of Africa. They were involved in the establishment of the Sultanate of Shewa and Ifat. Military Engagements: By the late 13th century, the Sultanate of Ifat, where the Argoba were influential, became a focal point of Muslim resistance against the expanding Christian kingdom. Impact of Conflicts: The region inhabited by the Argoba was central to the military conflicts due to its strategic location along major caravan trade routes. This led to the destruction of sultanates and a fragmentation in settlement patterns.
4. The Afar
Territorial Movement: The Afar moved eastward due to drought, reaching the middle Awash River. Their territory, crucial for trade routes linking the Horn’s ports, became a contested area between Christian and Muslim forces. Economic Adaptation: The Afar’s pastoral economy allowed them to withstand the destructive effects of ongoing wars, enabling their survival and adaptability during the conflicts.
5. The Somali
Territorial Influence: The Somali territory was central to medieval trade route control. Population pressures before the Wars of Imam Ahmed al-Ghazi contributed to their military strength. Short-term Movement: Somali population movements were impactful during the early conflicts but diminished after Imam Ahmed’s defeat in 1543, leading to a return to their original regions.
6. The Oromo
Historical Background: The Oromo, an indigenous Cushitic-speaking people, occupied large parts of Ethiopia and the Horn of Africa by the time of the Aksumite Empire. They were originally settled in the south-central highlands of Ethiopia, with Madda Walabu as a significant center.
Expansion Factors: Demographic Pressure: Growing populations necessitated expansion into new lands. Conflict Influence: The wars between Christian kingdoms and Muslim sultanates also drove the Oromo to move and expand into new areas.

- Oromo Confederacies and Expansion (1522-1618)
Confederacies: The Oromo were divided into two major confederacies:
Barentu: Comprising the Karayu, Marawa, Ittu, Humbana, Akachu, Wollo, and Arsi clans.
Borana: Consisting of the Mecha, Tulama, southern Borana, and Guji clans.
Expansion Stages:
Early Expansion: From 1522 to the mid-16th century, marked by smaller, slow movements.
Large-Scale Expansion: From the mid-16th century to 1618, characterized by rapid and forceful expansion.
Military Campaigns: The Oromo fought a series of battles known as the Butta wars, gaining control over various regions and displacing or assimilating other populations. - Establishment of Gadaa Centers
Gadaa System: The Oromo established several Gadaa centers during their expansion, which served as administrative and political hubs:
Oda Nabee (Tulama)
Oda Roba (Arsi)
Oda Bultum (Hararge)
Oda Bisil (West Shewa)
Oda Bulluq (Horro-Guduru)
Leadership: Gadaa leaders like Dawe Gobbo, Anna Sorra, and Makko-Bili played crucial roles in the expansion and governance. - Effects of Oromo Expansion
Destruction of Old States: The Oromo expansion led to the destruction of earlier states such as Damot, Bizamo, and Ennarya. The inhabitants of these states were either assimilated or displaced.
Impact on Christian Kingdoms: The expansion significantly weakened the Christian kingdoms, which had to relocate their political centers from Shewa to areas around Lake Tana and Gondar.
Decline of the Sultanate of Adal: The Sultanate of Adal was reduced to a walled town of Harar, largely due to Oromo pressure and internal conflicts. - Long-Term Consequences
Settlement and Integration: The Oromo eventually transitioned to sedentary agriculture and adopted Christianity and Islam over time.
Formation of New Kingdoms: Despite the initial upheavals, the Oromo managed to form their own kingdoms and integrate into the Ethiopian region’s political landscape.
7.4.1 Gadaa System of the Oromo: A Comprehensive Overview
Introduction
The Gadaa system is a traditional socio-political institution of the Oromo people, encompassing a structured approach to governance and societal organization. Developed over generations, the system is based on age-grades and provides a framework for political, economic, social, and religious activities. It plays a crucial role in conflict resolution, moral enforcement, and social cohesion.
Key Features of the Gadaa System
- Age-Grades and Generational Classes
- Age-Grades: The Gadaa system organizes society into ten age-grades, each with specific roles and responsibilities.
- Dabale (Birth-8 years): Socialization
- Game (9-16 years): Early socialization and preparation
- Folle (17-24 years): Military training and agricultural work
- Qondala (25-32 years): Military service
Raba-Dori (33-40 years): Candidates for political power
- Gadaa (41-48 years): Leaders of the Gadaa government
- Yuba (49-80 years): Senior advisors, educators, and ritual leaders
- Generational Classes: Five classes operate in parallel, with each class taking on leadership roles for eight-year terms.

Principles of the Gadaa System
- Periodic Succession: Power is transferred every eight years to prevent one-man rule and ensure fresh leadership.
- Power-Sharing: Leadership roles are shared among various representatives, including the Abba-Gadaa (head of the Gadaa class), Abba Bokku (father of the scepter), and other officials.
- Democratic Elements: The system incorporates democratic elements such as representation, power-sharing, and checks and balances.
Organizational Structure
- Gadaa Assembly (Chaffe): The assembly, or chaffe, consists of members from the ruling Gadaa class and is the primary decision-making body. It meets under a sycamore tree (Odaa), symbolizing dialogue and consensus.
- Gumi-Gayo (Assembly of Representatives): This assembly serves as the legislative body where any individual can bring matters for discussion. Each class sends delegates to the Caffe, the legislative body, to discuss and amend laws.
Roles and Responsibilities
- Abba-Gadaa: The head of the Gadaa government, elected every eight years, who oversees the administration and governance.
- Abba Bokku: The father of the scepter, responsible for ceremonial duties.
- Abba Chaffe: Head of the assembly.
- Abba-Dula: War leader.
- Abba Sera: Father of the law, responsible for legal matters.
- Abba Alanga: Judge.
- Abba Sa’a: Treasurer.
Conflict Resolution and Social Cohesion
- Guma (Reparation): Compensation mechanisms for resolving grievances.
- Arara (Conflict Resolution): A traditional method for resolving disputes and maintaining social harmony.
- Women’s Rights: The Sinqe institution helps protect women’s rights and involves them in various social and political activities. Women from different life stages, such as guduru (pre-pubescent) and kalale (wives of high-ranking officials), hold significant roles.
Revitalization and Historical Context
- Madda Walabu: Became the central assembly (chaffe) and seat of the senior Qallu until 1900.
- Historical Interruptions: The Gadaa system faced interruptions and revitalizations due to internal and external factors. For example, the Borana-Barentu Gadaa was revived in 1450 after nearly two generations of interruption.
Principles of Governance
- Rule of Law: Laws are upheld above all, ensuring accountability and fairness.
- Checks and Balances: Regular succession, division of power among branches, and balanced opposition among parties.
- Testing Period: A time gap between elections and investiture ensures careful selection of leaders.
- Subordination of Warriors: Warriors are subordinate to deliberative assemblies, maintaining civil authority over military power.