The religion of Haitian Vodou has been present in Cuba since at least the 18th century. It was transmitted to the island by Haitian migrants, the numbers of whom grew rapidly in the early 20th century, and is primarily practised by their descendants. It is distributed primarily in eastern parts of the island, especially in Oriente. In Cuba, some practitioners of Haitian Vodou have also become involved in the related Afro-Cuban religion of Santería.