Pope Francis has named Archbishop Víctor Manuel Fernández, his longtime personal theologian and ghostwriter, to lead the Dicastery for the Doctrine of the Faith.The Argentine prelate succeeds Cardinal Luis Ladaria Ferrer, SJ, 79, who has been prefect of the dicastery since 2017.Fernández, almost 61, will take up his new post in the middle of September, the Vatican said. The prolific writer has been archbishop of La Plata, Argentina, since 2018.