IDACIO. - Chronicler, born at Lemica, in Galicia (today Jinzo de Lima, in Portugal), about 395, died about 468. Bishop of Aquae Flaviae (today Chaves in Portugal) from 427, he took part in the political struggles against the invading Suebi and, above all, in the religious struggles against the Priscillianists; indeed, Leone Magno places him alongside s. Turibio in connection with the Synod of Galicia (Ep. 15, 17; PL 54, 692), and Turibio himself writes to him concerning these heretics (ibid. cols. 693-95).
He wrote a Chronicon, continuing that of s. Girolamo, which covers the years from 378 to 460 and is of exceptional importance for the period of the invasion and for the history of Galicia under the Suebi. The first part, from 378 to 427, is based on oral traditions and written sources, now lost; for the remainder, his sole sources are his own experience and personal recollections. The work, which has a national character, pays special attention to events in Spain and has the merit of having introduced the Hispanic era as a system of dating (v. ERA).