The Greco-Turkish Mixed Arbitral Tribunal was an international judicial body established under the Greco-Turkish Agreement of December 1, 1926, to resolve legal disputes arising from the compulsory population exchange between Greece and Turkey. It operated under the supervision of the League of Nations and played a crucial role in addressing conflicts related to property restitution, compensation claims, and jurisdictional disagreements stemming from the exchange.

The Treaty of Lausanne (1923) mandated the relocation of over 1.5 million people—Greek Orthodox Christians from Turkey to Greece and Muslims from Greece to Turkey—to create ethnically homogeneous states. This exchange, while aimed at reducing ethnic tensions, caused numerous disputes over properties, assets, and the interpretation of legal provisions

To address these issues, the Greco-Turkish Agreement of 1926 established the Greco-Turkish Mixed Arbitral Tribunal, which functioned alongside the Mixed Commission for the Exchange of Greek and Turkish Populations. While the commission managed logistical and administrative matters, the tribunal was responsible for adjudicating disputes related to the agreement.^[1]

The tribunal was composed of three members:

• One appointed by Greece
• One appointed by Turkey
• A neutral chairperson appointed by the Permanent Court of International Justice (PCIJ) or the League of Nations to ensure impartiality^[2]

Jurisdiction

The tribunal's jurisdiction included:

• Property disputes: Determining ownership and compensation for properties abandoned by relocated individuals.
• Financial claims: Resolving issues related to debts, unpaid rents, and contracts disrupted by the population exchange.
• Jurisdictional Challenges: Interpreting the powers of the Mixed Commission and ensuring the proper implementation of the 1926 agreement's provisions.
• Arbitration procedures: Addressing disputes referred to arbitration under Article IV of the Final Protocol annexed to the 1926 Agreement.

In 1928, the League of Nations requested an advisory opinion from the Permanent Court of International Justice (PCIJ) regarding the tribunal's authority under Article IV of the Final Protocol. The PCIJ clarified that the Mixed Commission held the exclusive right to initiate arbitration and decide whether the conditions for arbitration were met.^[3]

This ruling was significant in defining the tribunal's scope of authority and streamlining arbitration processes. It also reinforced the independence of international bodies in resolving intergovernmental disputes.

The tribunal dealt with numerous claims related to the valuation and compensation of properties left behind by displaced populations. These cases often involved complex questions of ownership, inheritance, and the valuation of abandoned assets.

The Greco-Turkish Mixed Arbitral Tribunal faced several challenges, including:

• Political tensions: Persistent mistrust between Greece and Turkey sometimes obstructed the tribunal's operations.
• Complex legal claims: Disputes often involved overlapping legal systems, incomplete documentation, and differing interpretations of treaty provisions.
• Humanitarian concerns: The tribunal's focus on legal and financial disputes sometimes overlooked the broader social and emotional consequences of forced migration.

Despite these challenges, the tribunal is recognized as a pioneering effort in international arbitration, contributing to the development of mechanisms for resolving post-conflict disputes.^[4]

The Greco-Turkish Mixed Arbitral Tribunal holds an important place in the history of international law, particularly for its role in managing disputes arising from forced migrations and population exchanges. Its work demonstrated the potential and limitations of international arbitration as a tool for post-conflict resolution.^[5]

The tribunal's decisions provided legal clarity on several contentious issues and served as a model for subsequent international bodies, including tribunals addressing property disputes after World War II.

• Interpretation of the Greco-Turkish Agreement