SB 10.78.30
asya brahmasanam dattam
asmabhir yadu-nandana
ayus catmaklamam tavad
yavat satram samapyate
Translation:
“O favorite of the Yadus, we gave him the seat of the spiritual master and promised him long life and freedom from physical pain for as long as this sacrifice continues.
Purport:
Although Romaharsana was not a brahmana, having been born of a mixed marriage, he was invested with that status by the assembled sages and thus given the brahmasana, the seat of the chief officiating priest.