Alexandre Sabès Pétion was the first president of the Republic of Haiti from 1807 until his death in 1818. One of Haiti's founding fathers, Pétion belonged to the revolutionary quartet that also includes Toussaint Louverture, Jean-Jacques Dessalines, and his later rival Henri Christophe. Regarded as an excellent artilleryman in his early adulthood, Pétion would distinguish himself as an esteemed military commander with experience leading both French and Haitian troops. The 1802 coalition formed by him and Dessalines against French forces led by Charles Leclerc would prove to be a watershed moment in the decade-long conflict, eventually culminating in the decisive Haitian victory at the Battle of Vertières in 1803.

The first Republic of Haiti controlled the southern portions of Haiti from 1806 until 1820. The republic, commonly referred to as South Haiti during its existence, was created on 17 October 1806, following the assassination of Emperor Jacques I and the overthrow of the First Empire of Haiti. The southern Republic of Haiti was ruled by General Alexandre Pétion, a free person of color, as President from 9 March 1807 until his death on 29 March 1818. He was succeeded by Jean-Pierre Boyer.