The Dominican War of Independence (Spanish: Guerra de Independencia Dominicana) was a war of independence that began when the Dominican Republic declared independence from the Republic of Haiti on February 27, 1844 and ended on January 24, 1856. Before the war, the island of Hispaniola had been united for 22 years when the newly independent nation, previously known as the Captaincy General of Santo Domingo, was unified with the Republic of Haiti in 1822. The criollo class within the country overthrew the Spanish crown in 1821 before unifying with Haiti a year later.