[1][2] In 1344, the regency concluded a further alliance with Bulgaria, which required the surrender of Philippopolis (Plovdiv) and nine other towns in northern Thrace along the river Evros.

Nevertheless, after their occupation, Ivan Alexander refrained from direct action against John VI Kantakouzenos' forces operating in southern and eastern Thrace.

[3] At the same time, Momchil, a former brigand whom Kantakouzenos had entrusted with control over the Merope (region) in the Rhodope mountains, switched over to the regency.

Pirot Fortress was declared Monument of Culture of Great Importance in 1979, and it is protected by Republic of Serbia.

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