At the very beginning of Leo I's pontificate, in the years 444-447, Turribius, the bishop of Astorga in León, sent to Rome a memorandum warning that Priscillianism was by no means dead, reporting that it numbered even bishops among its supporters, and asking the aid of the Roman See.
No mesmo comezo do pontificado de León I, nos anos 444-447, Turribius, o bispo de Astorga, en León, enviou a Roma un memorando advertindo que o priscilianismo non estaba morto de ningún xeito, avisando que contaba ata bispos entre os seus partidarios, e pedindo a axuda da sé romana.