Treaty of Targoviste

When Wallachia surrendered to the Third Bulgarian Empire, the Treaty of Targoviste was drafted and signed on September 3rd, 1512. This was unofficially a treaty in Part 1 of Episode X ("Mare Nostrum") of Brazilian Mapping's Alternate History of Europe series. The terms are as follows:
# Wallachia shall cede southern Dobruja to Bulgaria.
# Wallachia shall switch sides.