John Lightfoot on Mark 15:43

[An honourable counsellor.] The Vulgar reads, a noble officer: Erasmus, an honourable senator: Beza, an honourable senator. The Talmud may serve here instead of a lexicon.

"Was it the chamber of the chief men? Was it not the chamber of the counsellors? First it was called, the chamber of the counsellors: but when the high priesthood was bought with money, and yearly changed, as the chief counsellors of the king are yearly changed, thence it was called the chamber of chief men." The Gloss is, counsellors, denotes princes. True, indeed, and hence noble men and common persons are contradistinguished. But why should one not understand those princes and nobles in the proper sense of the word counsellors? For who sees not that the word is Greek? and so the Aruch; it is a Greek word.

Which fixeth our eyes faster upon the words of the Gloss at the Gemara in the place alleged; "From the beginning, in the days of Simeon the Just, who lived a greater while, they called it the chamber of the counsellors." What? did the Greek language so flourish at Jerusalem in the times of Simeon the Just, that a chamber in the Temple should be called by a Greek name? If that Simeon be he who met Alexander the Great, which the Talmudists suppose, then some reason appears for it; but if not, inquire further. However, that was the chamber of the high priest, as appears often in the Talmudists; not that he always lived there, nor that once in the year he resorted thither; but because it was that place where he sat with the council of the priests, and consulted concerning the public service and affairs of the Temple. Hence in the Jerusalem writers mention is made of Simeon the counsellor. And in this sense is that to be taken, if I mistake not, which occurs once and again in the Babylonian Talmudists, concerning the sons of the high priests, deciding several things; and the house of judgment of the priests.

Hence we think Joseph of Arimathea was called with good reason a counsellor, because he was a priest, and one of that sacerdotal bench. It was called the chamber, (saith the Aruch) of counsellors.