The Shatapatha Brahmana 1.9.1 mentions about a certain priest who went to heaven after performing a particular fire-sacrifice:
Thereupon he pronounces the 'All-hail and blessing' (sam-yos). Now it was Samyu Bârhaspatya who perceived, in its true nature, the consummation of the sacrifice. He went to share in the world of the gods. Thereupon that (knowledge) was entirely lost to men.
It then became known to the Rishis, that Samyu Bârhaspatya had perceived, in its true nature, the consummation of the sacrifice, and had gone to share in the world of the gods. By pronouncing the samyoh, they attained to that same consummation of the sacrifice which Samyu Bârhaspatya had perceived; and to that same consummation of the sacrifice, which Samyu Bârhaspatya had perceived, this (Hotri) attains by pronouncing the sam-yoh. For this reason he pronounces the 'All-hail and blessing.'
He intones, 'We long for that All-hail and blessing (sam-yoh);' whereby he says, 'We long for that consummation of the sacrifice which Samyu Bârhaspatya perceived.'
I want to know who is this Samyu Bârhaspatya who achieved heaven by means of the sacrifice & what is his life story? The only two sons of Brihaspati that come to my mind are Kacha and Bharadwaj so is he related to either of them or is a different descendant?