The meaning of Crown of thorns in the Bible
(From Easton's Bible Dictionary)

our Lord was crowned with a, in mockery by the Romans (Matthew 27:29). The object of Pilate's guard in doing this was probably to insult, and not specially to inflict pain. There is nothing to show that the shrub thus used was, as has been supposed, the spina Christi, which could have been easily woven into a wreath. It was probably the thorny nabk, which grew abundantly round about Jerusalem, and whose flexible, pliant, and round branches could easily be platted into the form of a crown. (See THORN,3.)

See more on the meaning of Crown Of Thorns in the Bible:
Crown Of Thorns {International Standard Bible Encyclopedia}

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