* Regimini militantis Ecclesiae was the papal bull promulgated by Pope Paul III on September 27, 1540, which gave a first approval to the Society of Jesus, also known as the Jesuits, but limited the number of its members to sixty.

* September 27 – The Society of Jesus ( Jesuits ) is approved by Pope Paul III, in his bull Regimini militantis Ecclesiae.

Fresco of Approving of bylaw of Society of Jesus depicting Ignatius of Loyola receiving the papal bull Regimini militantis Ecclesiae from Pope Paul III.

Regimini militantis Ecclesiae ( Latin for To the Government of the Church Militant ) was the papal bull promulgated by Pope Paul III on September 27, 1540, which gave a first approval to the Society of Jesus, also known as the Jesuits, but limited the number of its members to sixty.

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The group of ' Friends in the Lord ' will ultimately form the nucleus of the Society of Jesus, approved in 1540 ( in Regimini militantis ecclesiae ).