Ishan Thakur is counted as one of Chaitanya Mahaprabhu’s branches:
Shrinath Mishra, Subhananda, Shri Rama, Ishan, Shrinidhi, Shri Gopikanta, Bhagavan Mishra [were branches of Chaitanya’s tree].
(Chaitanya Charitamrita 1.10.110)
How can I understand the activities of Ishan Thakur, whom Nimai used to lovingly call “father”? The son of Sachi, Nimai Chand, was his very life and Nimai would not go anywhere without him. In his childhood, Nimai was very naughty and He would make all kinds of capricious demands that Ishan would do his best to fulfill. (Bhakti-ratnakara 12.95-7)
Ishan Thakur also had the chance to serve Nityananda Prabhu, Shri Chaitanya Mahaprabhu’s other self. Before the two sat down to eat in Sachi’s house, Ishan Thakur would bring water to wash their feet. The Lord would plea with His mother to be able to invite Nitai and when she finally agreed would go Himself to invite him.
Ishan gave water for Gaura and Nitai to wash their feet and then they sat down to eat.
(Chaitanya Bhagavat 2.8.59)
As one of the Lord’s eternal associates, Ishan Thakur was fully aware of His divine nature. He knew that the worship of the Devotee is more important than even the worship of the Lord Himself. Thus he performed all kinds of service to Sachi Devi, who is none other than Yashoda Devi and was blessed by her affection. The Lord too blesses His Devotees through His Devotee’s merciful attitude. The Lord’s mercy follows upon the mercy of the Devotee. Ishan Thakur glories are described in the work known as the Vaishnava-vandana:
vandiba ishana-dasa kara-joria kari
shaci-thakurani yare sneha kaila vari
I pay obeisances to Ishan Das with folded hands, for Sachi Thakurani was very affectionate towards him.
The Brahmin said, “Look, here comes Ishan. What can I say, no one really understands his great qualifications. He has the reputation of knowing all the truths about the Lord, and he served Sachi by doing whatever she needed having done. Because he rendered such service to the Lord’s mother, Ishan is uniquely fortunate in the fourteen worlds. Even though I saw with my own eyes how much affection she had for him, I am unable to find the words to describe it."
Ishan, most fortunate in the fourteen worlds, served the Lord’s mother constantly.
(Chaitanya Bhagavat 2.8.74)
When Mahaprabhu took sannyasa and left for Puri, Ishan was left with the responsibility of taking care of his mother Sachi and his wife Vishnupriya Devi and supervising their household. In his commentary to the Chaitanya Bhagavat (2.8.73), where it is said that Ishan Thakur did all the cleaning of the house, etc., Shrila Bhaktisiddhanta Saraswati Goswami Thakur writes: “Ishan was the servant in Mahaprabhu’s house. He gathered up the rice that had been thrown all over [by Nityananda] and made the house proper. There was no limit to Ishan’s good fortune. He was able to render service to the Lord’s mother throughout his entire life. Even after the Lord took sannyasa, he was engaged in the service of the Lord’s mother and His wife, showing the extent of the blessings he had received. He is therefore described as ‘most blessed’ or ‘the most fortunate amongst the blessed.’”
Ishan Thakur lived a very long life. He was still living even after the disappearance of Vishnupriya Devi and all the other Devotees of Mahaprabhu in Navadwip. Thus when Shrinivas Acharya, Narottama Thakur and Ramachandra Kaviraj came to Navadwip on pilgrimage, only Ishan was able to show them where all the places of the Lord’s pastimes were. In the Bhakti-ratnakara, it is said that when Ishan showed these Devotees the holy places, they were already old and in a state of disrepair. This gives some idea of how old he must have been.
Nearly everyone has disappeared from Navadwip. No one but the Lord’s servant Ishan remains here.
I heard from some people while on my way here that Ishan has disappeared.
After Mahaprabhu and Sachi Mata had disappeared, Vamshivadanananda Thakur served Vishnupriya Devi and Ishan Thakur.
Other than this Ishan, there were several other associates of the Lord who had the same name. (1) Sanatan Goswami’s servant was named Ishan. (2) There was a Devotee in Vrindavan of that name. He is mentioned in the Bhakti-ratnakara as a member of the party of Devotees who accompanied Rupa Goswami to the house of Vitthaleshvara to have darshan of Govardhanadhari Gopal. He also is said to have blessed Shrinivas Acharya, Narottama Das Thakur and Shyamananda Prabhu when they started their voyage to Bengal with the Goswamis’ books. (3) In the Gaudiya Vaishnava Abhidhana, there is mention of a certain Ishan Acharya who is identified as Vraja’s Yauna Manjari. (4) The author of the Advaita-Prakasha was named Ishan Nagara.
[Excerpted from “Shri Chaitanya: His Life & Associates” by Shrila Bhakti Ballabh Tirtha Maharaj]