Cf.

Evers, _Analecta ad Fr.

Minorum historiam_, Leipsic, 1882, 4to, pp.

7 and 11.
That which appears to me decidedly to tip the balance in favor of 1217, is the fact that the missionary friars were persecuted because they had no document of legitimation; and in 1219 they would have had the bull _Cum dilecti_, from June 11th of that year.

The Bollandists, who hold for 1219, have so clearly seen this argument that they have been obliged to deny the authenticity of the bull (or at least to suppose it wrongly dated).