The most famous and earliest biographer of Chaitanya, who wrote Chaitanya Charitamrita, was Kritivasa.

Kritivasa, a prominent Vaishnava poet and devotee, is widely recognized as the most famous and earliest biographer of Chaitanya Mahaprabhu. He wrote the renowned literary work called Chaitanya Charitamrita, which provides a detailed account of Chaitanya's life, teachings, and spiritual journey.

Chaitanya Mahaprabhu:
Chaitanya Mahaprabhu, also known as Gauranga, was a 16th-century Indian saint and social reformer. He was born in 1486 in Nabadwip, Bengal, and is considered to be the incarnation of Lord Krishna by his followers. Chaitanya played a crucial role in popularizing the congregational chanting of the Hare Krishna mantra and promoting the philosophy of bhakti (devotion) in the form of Krishna consciousness.

Kritivasa and Chaitanya Charitamrita:
Kritivasa was a devoted follower of Chaitanya Mahaprabhu and dedicated his life to spreading his teachings through poetry and literature. He became one of the key figures in the Gaudiya Vaishnavism tradition, which emerged from Chaitanya's teachings.

Chaitanya Charitamrita, written by Kritivasa, is an epic biography of Chaitanya Mahaprabhu. This literary masterpiece is divided into three sections: Adi Lila, Madhya Lila, and Antya Lila. Each section provides a comprehensive account of Chaitanya's life, his interactions with devotees, his travels, and his spiritual realizations.

Significance of Chaitanya Charitamrita:
Chaitanya Charitamrita is considered a foundational text in the Gaudiya Vaishnavism tradition and holds immense importance for followers of Chaitanya Mahaprabhu. It not only chronicles the life of Chaitanya but also delves deep into his philosophy, teachings, and the inner experiences of his devotees.

The work is revered for its poetic beauty, spiritual insights, and the depth with which it portrays Chaitanya's divine pastimes and interactions with his followers. It has significantly contributed to the preservation and propagation of Chaitanya's teachings and continues to inspire and guide devotees in their spiritual journey.

In conclusion, Kritivasa, a devout follower of Chaitanya Mahaprabhu, wrote Chaitanya Charitamrita, the most famous and earliest biographical account of Chaitanya's life and teachings. This literary masterpiece holds immense significance in the Gaudiya Vaishnavism tradition and has played a pivotal role in popularizing Chaitanya's philosophy of bhakti and Krishna consciousness.