Ammar bin Yasir is one of the most famous companions of Prophet Muhammad (pbuh), and was among the slaves freed by Abu Bakr (RA). Ammar was born in the Year of the Elephant (570). Therefore he is as old as Prophet Muhammad (pbuh).
Ammar was a friend of Prophet Muhammad (pbuh) even before Islam. He was one of the intermediaries in his marriage to Khadijah Al-Kubra.
He was a slave of Banu Adi. He was killed by a group loyal to Mu’Awiyah in the battle of Siffin (657).
Sultan Qutb-ud-din Aibak also called “Lakh Baksh Sultan” (the donator of hundreds of thousands) (Urdu: قطب الدین ایبک) (Qutb-ud-din meaning “Axis of the Faith”) was the first Muslim Emperor of India who ruled from his capital in Delhi where he built Qutub Minar and the Quwwat Al Islam mosque.
Qutbuddin was born somewhere in Central Asia; he was of Turkic descent. While still a child he was captured and sold as a slave (ghulam). He was purchased by the chief Qazi of Nishapur, a town in the province of Khorasan in northeastern Iran. The Qazi treated him like one of his own sons, and Aibak received a very good education in all the major subjects, was a very brave warrior and an appreciable ruler and intelligent in languages including fluency in Persian and Arabic and training in archery and horsemanship. When his master died, his master’s sons, who were jealous of Aibak, sold him to a slave merchant. Aibak was, then, finally purchased by the great General Shahabuddin Muhammad Ghauri, then governor of Ghazni.
Abdu-l-Rahman Ibrahim Ibn Sori (a.k.a. Abdul-Rahman) was a prince from West Africa who was made a slave in the United States. In 1828, he was freed after spending 40 years in slavery by the order of President John Quincy Adams and Secretary of State Henry Clay after the Sultan of Morocco requested his release.