Also unto Shemaiah his son were sons born, that ruled throughout the house of their father: for they were mighty men of valor.
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George Leo Haydock
Semei, who is called Semeias, ver. 4., and 7. The last syllable is not lost in Hebrew or Septuagint. (Haydock)
Valour. Their post was of a military nature, and required strength. Josephus says, some of the gates could hardly be shut by twenty men.