Ancient territorial boundaries can influence modern territorial sovereignty claims to a certain extent, but their role is limited. The determination of modern territorial sovereignty mainly depends on the following aspects: 1. **International law and treaties**: The territorial sovereignty of modern countries is usually determined according to international law and treaties signed by various countries. These legal documents clearly define the borders and scope of sovereignty of a country. 2. **Effective control**: The actual control of a country over its territory is also an important factor in determining sovereignty. Even if there are historical claims, if a country has long-term and effective control over the area, other countries will usually respect its sovereignty. 3. **International recognition**: The recognition of other countries and international organizations is also an important link in establishing territorial sovereignty. The recognition of the international community can consolidate a country's sovereignty over its territory. 4. **Historical evolution**: Although ancient territorial boundaries can serve as historical basis, modern territorial disputes are more concerned with modern development, national self-determination, and changes in the international environment. Therefore, although ancient territorial boundaries can provide historical background and basis for modern territorial sovereignty claims, they are not the decisive factor. The determination of modern territorial sovereignty requires a comprehensive consideration of international law, actual control, international recognition, and current political and social conditions.