Liberator (noun)

1. A person who liberates or sets free.
2. A person who helps others to achieve freedom.

Origin:

Early 15c., from latin liberator, agent noun from liberare "set free" (see liberate).

Examples:

1. Gandhi is considered a liberator for his role in India's independence movement.
2. The soldiers were hailed as liberators when they liberated the city from the enemy.
3. Martin Luther King Jr. is considered a liberator for his role in the Civil Rights Movement.
4. The liberator led the charge to free the slaves.
5. Nelson Mandela is considered a liberator for his role in ending Apartheid in South Africa.