And by this present charter have confirmed for us and our heirs in perpetuity, that the English Church shall be free, and shall have its rights undiminished, and its liberties unimpaired.

from Barons of King John of England – The Magna Carta on Rap Genius

Meaning

Predecessor of the Establishment clause in the Bill of Rights

Note that separation of Church and State is not 100% guaranteed by this provision

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