A sugar dealer.
On his way from Andhakkavinda to Rājagaha he met the Buddha seated at the foot of a tree, and, with his permission, presented a pot of sugar (gulakumbha) to the monks.
When the monks had shared as much of the sugar as they wished, much was left over, and the Buddha asked Kaccāna to throw it into the water. This he did, and the water crackled.
The Buddha preached to Kaccāna who accepted his teaching.
Vin.i.224ff.