Agroecius was the addressee of one extant letter from Sidonius Apollinaris, who sought Agroecius' aid in the dispute over who would inherit the vacant bishop's see in Bourges in 470 (Agroecius indeed traveled to Bourges to render his assistance); and he is probably alluded to (although not named) in another of Apollinaris' letters, which speaks of a bishop of great eloquence and learning.Sidonius Apollinaris, Epistles vii. 5.; cf. Sidonius Apollinaris, Epistles vii. 9.6 There was also at that time a bishop "Agrycius", the addressee of a letter of Salvian apologizing for his disrespectful behavior, who is generally taken to be this Agroecius.
