Avicenna
Avicenna was born in Afshana, a village near Bukhara (in present-day Uzbekistan), the capital of the Samanids, a Persian dynasty in Central Asia and Greater Khorasan. His mother, named Sitāra, was from Bukhara; his father, Abdullāh, was a respected Ismaili scholar from Balkh, an important town of the Samanid Empire, in what is today Balkh Province, Afghanistan. His father worked in the government of Samanid in the village Kharmasain, a Sunni regional power. After five years, his younger brother, Mahmoud, was born. Avicenna first began to learn the Quran and literature in such a way that when he was ten years old he had essentially learned all of them.
Haridasa Thakur
Born in the village of Buron (Budana), in the present district of Sat-khira, which was previously a sub-division of Khulna, now in Bangladesh. Haridasa was 35 years older than Chaitanya Mahaprabhu and his prayers along with prayers of Advaita Acharya were the reason for Chaitanya Mahaprabhu descent. Ishana Nagara in his book "Advaita Prakasha", explains in great length that Haridasa Thakur was a follower of Advaita Acharya and also his close friend, he was raised in a Muslim family and then converted to Vaishnavism as a young man. Advaita Acharya repeatedly proclaims that becoming a Vaishnava, regardless of one's background, removes all past conditioning.