Basarab I of Wallachia in the context of "Voivode"

Wallachia is a geographical region of modern-day Romania, as well as one of the two historical Romanian principalities that laid the foundation for the establishment of the modern Romanian state. It is situated north of the Lower Danube and south of the Southern Carpathians. Wallachia was traditionally divided into two sections, Muntenia (Greater Wallachia) and Oltenia (Lesser Wallachia). Dobruja could sometimes be considered a third section due to its proximity and brief rule over it. Wallachia as a whole is sometimes referred to as Muntenia through identification with the larger of the two traditional sections.

Wallachia began to form as a principality around the 13th century, following the gradual unification of several smaller Romanian political entities. By 1330, the state had consolidated following Basarab I's victory in the Battle of Posada against the Kingdom of Hungary, ushering in a period of relative independence. In 1417, Wallachia was forced to accept the suzerainty of the Ottoman Empire for the first time; this suzerainty lasted until the mid-19th century. However in general Wallachia was able to preserve autonomy within the Empire as well as experience interruptions to Ottoman rule brought about by local rulers such as Vlad the Impaler and Michael the Brave and later external powers such as the Polish-Lithuanian Commonwealth and the Russian Empire.

The Battle of Posada (9–12 November 1330) was fought between Basarab I of Wallachia and Charles I of Hungary (also known as Charles Robert).The small Wallachian army led by Basarab, formed of cavalry and foot archers, as well as local peasants, managed to ambush and defeat the 30,000-strong Hungarian army, in a mountainous region.

The battle resulted in a major Wallachian victory. Sălăgean writes that the victory "sanctioned the independence of Wallachia from the Hungarian crown" and altered its international status. Georgescu describes Wallachia as the "first independent Romanian principality." Although kings of Hungary continued to demand loyalty from the voivodes of Wallachia, Basarab and his successors yielded to them only temporarily in the 14th century.

Thocomerius, also Tihomir, was the father of Basarab, who would become the first independent voivode of Wallachia. Many Romanian historians, such as Vlad Georgescu and Marcel Popa, believe that Thocomerius was a voivode in Wallachia who succeeded Bărbat, who ruled around 1278; others, such as Tudor Sălăgean, refer to him as a local potentate whose status cannot be specified.