Byzantine–Bulgarian treaty of 716

It was signed by the son of the ruling Bulgarian Khan Tervel, Kormesiy[1] and the Byzantine Emperor Theodosius III.

In 705 AD, the deposed Byzantine emperor Justinian II asked the Bulgarian khan Tervel for assistance to regain his throne.

Tervel was awarded with the title Caesar, a huge amount of gold, silver and garments as well as the region called Zagore to the south of Stara Planina.

However, when Justinian II stabilized his position in Constantinople he invaded Bulgaria to retake the lost territory but was defeated in the Battle of Anchialus (708) and later executed by his political rivals.

The treaty lasted until 756 when the Bulgarian Khan Kormisosh asked for tribute for the newly constructed Byzantine border fortifications but his envoy was ignored.