Please answer the following question: Information:  - Haiti , officially the Republic of Haiti, is a sovereign state located on the island of Hispaniola in the Greater Antilles archipelago of the Caribbean Sea. It occupies the western three-eighths of the island, which it shares with the Dominican Republic. Haiti is in size and has an estimated 10.6 million people, making it the most populous country in the Caribbean Community (CARICOM) and the second-most populous country in the Caribbean as a whole.  - Sylvain Salnave ( 1827 -- 1870 ) was a mulatto Haitian general . He was the President of Haïti from 1867 to 1869 . In 1867 he was elected president after he led the overthrow of President Fabre Geffrard . During his term there were constant civil wars between the various factions .  - Faustin-Élie Soulouque (15 August 1782  6 August 1867) was a career officer and general in the Haitian Army when he was elected President of Haiti in 1847. In 1849 he was proclaimed Emperor of Haiti under the name "Faustin I". He soon purged the army of the ruling elite, installed black loyalists in administrative positions, and created a secret police and a personal army. In 1849 he created a black nobility in the country. However, his unsuccessful attempts to reconquer the neighbouring Dominican Republic undermined his control and a conspiracy led by General Fabre Nicolas Geffrard forced him to abdicate in 1859.  - Guillaume Fabre Nicolas Geffrard (September 19, 1806  December 31, 1878) was a mulatto general in the Haitian army and President of Haiti from 1859 until his deposition in 1867. After collaborating in a coup to remove Faustin Soulouque from power in order to return Haiti back to the social and political control of the colored elite, Geffrard was made president in 1859. To placate the peasants he renewed the practice of selling state-owned lands and ended a schism with the Roman Catholic Church which then took on an important role in improving education. After surviving several rebellions, he was overthrown by Major Sylvain Salnave in 1867.    What is the relationship between 'sylvain salnave' and 'president of haiti'?
A:
position held