 During Froia's siege, Taius had been working on a revision of the "Lex Visigothorum" and was unable to leave the city.The result was what has been regarded as a “poorly organized” book called "Sententiarum libri V", which drew heavily upon the writings of Gregory and Saint Augustine, his only known work.He participated in the Eighth Council of Toledo, the Ninth Council of Toledo and the Tenth Council of Toledo.