Christ Himself

Ignatius of Loyola spoke as founder of a work in which he was but an instrument, he spoke in the name of the Society which he was intending to establish. In this state of mind he entered into the chapel, and prayed with extraordinary fervour, and fell into an ecstasy.

He found himself enlightened and fortified by a vision which took place not on earth, but in Heaven, in which he saw Jesus Christ holding His Cross aloft, and saying, "I will be favourable to you at Rome." 

God therefore signified to him the place to which he was to go, and assured him at the same time that he would succeed in founding the Society of Jesus, and that Christ Himself would be the true Head and Founder of it, 

Link (here) to the mentioned portion of the book entitled, The Life of St. Ignatius of Loyola, Fr. Gennelli, S.J.