Chaitanya Mahaprabhu , who appeared 536 years back was an Incarnation of Bhagawan Shri Krishna - Scriptural Evidence from various Puranas, Gita and other Scriptures

Chaitanya Mahaprabhu was born in Mayapur in the town of Nodia, just after sunset on the evening of the 23rd Falgun, 1407 Advent of Sakabda i.e. on the 18th Februrary, 1486 of the Christian era.

I will take birth as the son of Sachi [bhavisyami sachi sutah], in Navadvip-Mayapur [mayapure navadvipe]. I will come in my complete spiritual form in the first part of Kali-Yuga. - Garud Purana

The Supreme Personality, Janardana, who is the object of the yogis' meditation [yogi-chintyo- janardanah], who saves the devotees from various sufferings, and who is the master of all yogic practices [ yogesvarah], who is always full of divine transcendental ecstasy and bliss [sandra-ananda-atmakah], will advent in His own divine form of Sri Chaitanya [Chaitanya-vapah]. - Padma Puran

I shall appear on this earth [mahi-tale] in the first part of Kali-Yuga [kaleh prathama sandhyayam] in a beautiful place on the bank of the Bhagirathi [bhagirathi-tate ramye ]. I shall have a golden form [gaurangah], and I shall take birth as the son of Sachi [bhavisyami sachi-sutah]. - Padma Puran

I will reveal my eternal golden form [gaurangotham mahi-tale] in the first part of Kali- Yuga [kaleh prathama sandhyayam]. I will advent on the earth on the bank of the Bhagirathi [ bhagirathi-tate bhumni] as son of Mother Sachi [bhavisyami sachi-sutah]. Brahma Puran.

O Divija (demigods), please come and advent as devotees on this earth [bhuvi jayadhvam jayadhvam] in the age of Kali-Yuga. I will incarnate as the son of Sachi [ bhavisyami sachi-sutah] to inaugurate the congregational chanting of the name of Krishna [kalau sankirtana arambhe]. - Narada Puran

In the first part [prathama sandhya] of the age of Kali, I will come among the brahmanas [karisyami dvijatisu] to save the fallen souls, [paritranaya tanu-bhrtam ] who are being burned by the troubles of the age of Kali [kalina dahyamananam]. - Garud Puran

The Supreme Person will appear in the first part of the age of Kali [janma prathama sandhyayam]. He will appear in the home of a Brahmana [bhavisyati dvijalaye ], to save the embodied conditioned souls [uddharaya tanu-bhrtam] burning in the troubles of Kali-Yuga. - Kurma Puran

In the first part of Kali-Yuga, the Supreme Personality of Godhead will come in a gold-like form. First He will become the husband of Lakshmi [Srimati Lakshmi Devi, Lord Chaitanya's first wife]. Then He will become a sannyasi, near Lord Jagannatha who will appear in a divine wooden form. - Garud Puran.

"The Supreme Personality of Godhead who in the Satya-Yuga appeared as a half-man, half-lion to cure a terrible disease that had ravaged the daityas, and who in the Treta-Yuga appeared as a person named Rama [Lord Ramachandra], the person who defeated the ten-headed Demon Ravana, and who in the Dvapara-Yuga removed the earth's burden, and protected the Gopa [cowherd men] people of Vraja-pura, will appear again in the Kali-Yuga. His form will be golden, He will delight in chanting the Lord's holy names, and His name will be Chaitanya." - Narshima Puran