CC Ādi 11.37

kālā-kṛṣṇadāsa baḍa vaiṣṇava-pradhāna
nityānanda-candra vinu nahi jāne āna
Word for word: 
kālā-kṛṣṇadāsa — Kālā Kṛṣṇadāsa; baḍa — great; vaiṣṇava-pradhāna — first-class Vaiṣṇava; nityānanda-candra — Lord Nityānanda; vinu — except; nāhi jāne — he did not know; āna — of anything else.
Translation: 
The twenty-second devotee of Lord Nityānanda Prabhu was Kālā Kṛṣṇadāsa, who was the ninth cowherd boy. He was a first-class Vaiṣṇava and did not know anything beyond Nityānanda Prabhu.
Purport: 

In the Gaura-gaṇoddeśa-dīpikā (132) it is said that Kālā Kṛṣṇadāsa, who was also known as Kāliyā Kṛṣṇadāsa, was formerly a gopa (cowherd boy) of the name Lavaṅga. He was one of the twelve cowherd boys.

Śrīla Bhaktisiddhānta Sarasvatī Ṭhākura writes in his Anubhāṣya, “Kāliyā Kṛṣṇadāsa had his headquarters in a village named Ākāihāṭa, which is situated in the district of Burdwan within the jurisdiction of the post office and police station of Katwa. It is situated on the road to Navadvīpa. To reach Ākāihāṭa, one has to go from the Bandel junction station to the Katwa railway station and then go about two miles, or one has to get off at the Dāṅihāṭa station and from there go one mile. The village of Ākāihāṭa is very small. In the month of Caitra, on the day of Vāruṇī, there is a festival commemorating the disappearance day of Kālā Kṛṣṇadāsa.”