Regulamentul Organic, a quasi-constitutional organic law is adopted in Wallachia, one of the two Danubian Principalities that were to become the basis of Romania.

Regulamentul Organic was a quasi-constitutional organic law enforced in 1831–1832 by the Imperial Russian authorities in Moldavia and Wallachia. The document partially confirmed the traditional government, including rule by the hospodars, and set up a common Russian protectorate which lasted until 1854. The Regulament itself remained in force until 1858. Conservative in its scope, it also engendered a period of unprecedented reforms which provided a setting for the Westernization of the local society. The Regulament offered the two Principalities their first common system of government.

An organic law is a law, or system of laws, that form the foundation of a government, corporation or any other organization's body of rules. A constitution is a particular form of organic law.

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.

The Danubian Principalities was a conventional name given to the Principalities of Moldavia and Wallachia, which emerged in the early 14th century. The term was coined in the Habsburg monarchy after the Treaty of Küçük Kaynarca (1774) in order to designate an area on the lower Danube with a common geopolitical situation. The term was largely used then by foreign political circles and public opinion until the union of the two principalities in 1859. Alongside Transylvania, the United Principalities of Moldavia and Wallachia became the basis for the Kingdom of Romania, and by extension the modern nation-state of Romania.