Mircea cel Batran (XIV - XV century) , during his reign was the most interesting period in the early history of Vallachia, in my opinion.

Mircea was able to defeat the Ottomans, and when the civil war struck the ottoman empire, he even managed to intervene alongside Musa and Mustafa. he also fought alongside the crusaders in the battle of Nicopole.

Also, earlyer, Basarab I the Founder in 1330, was able to inflict a crushing defeat upon the Hungarians at the battle of Posada, when he managed to defeat (in a treacherous ambush), the 30 000 men strong army of the Hungarian king Carol Robert de Anjou, putting an end to the Hungarians expansion towards the Black Sea.

Wallachia also had a rich cultural-religious life... more to come