Smith's Bible Dictionary
So. "So, king of Egypt," is once mentioned in the Bible - 2 Kings 17:4. So has been identified by different writers, with the first and second kings, of the Ethiopian twenty-fifth dynasty, called by Manetho, Sabakon (Shebek) and Sebichos (Shebetek).
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Smith, William, Dr. Entry for 'So'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/s/so.html. 1901.