Boyd’s Bible Dictionary:
(royal friend). A messenger sent by captive Jews to inquire about the ritual (Zech. 7:2).
Concise Bible Dictionary:
One sent unto the house of God, in the time of Darius, to pray and to consult with the priests and prophets respecting the continuation of fasting in the fifth month (Zech. 7:2). This fast had probably been observed in commemoration of the destruction of Solomon’s temple (2 Kings 25:8-9). God’s answer, through Zechariah, was that they had not fasted to Him: it was insincerity on their part.
Strong’s Dictionary of Hebrew Words:
Meaning:
from 7276 and 4428; king's heap; Regem-Melek, an Israelite
Jackson’s Dictionary of Scripture Proper Names:
stoning of the king
Potts’ Bible Proper Names:
A throng, or troop, of the king; king’s heap; royal friend:―an Israelite [REGEM and MELECH], Zech. 7:2. {Agmen regis}