Charles, whose royal assent was required for the bills to become law, was only willing to consider such an assembly if the members were chosen by the clergy, as was done in Convocation, the assembly of clergy of the Church of England.
Charles was only willing to consider such an assembly if the members were chosen by the clergy, as was done in Convocation. Convocation was the assembly of clergy of the Church of England. Charles's royal was required for the bills. This was to become law.