Michael I, was Voivode of Wallachia from 1415 to 1420. He was the only legitimate son of Mircea I of Wallachia, who made him his co-ruler. Styled as prince from 1415, Michael became sole ruler after his father died in early 1418. His support for a Hungarian campaign against the Ottoman Empire caused the Ottoman Sultan, Mehmed I, to invade Wallachia, forcing him to agree to pay tribute. After Michael failed to respect the treaty, the Ottomans gave assistance to his rival, Dan, who crossed into Wallachia in 1420. Dan and his Ottoman allies defeated the Wallachian army, and Michael was killed on the battlefield.

Wallachia or Walachia is a historical and geographical region of modern-day Romania. It is situated north of the Lower Danube and south of the Southern Carpathians. Wallachia was traditionally divided into two sections, Muntenia and Oltenia. 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.