Taius (Taio, Tago, Tajo, Tajón, Tayon) (c. 600—c. 683) was a bishop of Zaragoza during the Visigothic period, from 651-664, succeeding his teacher Saint Braulius in this post. His surname was Samuel (Samuhel).
At the request of Quiricus of Barcelona, Taius compiled a collection of extracts from the work of Gregory the Great in 653–654, when progress on the compilation was slowed by the revolt of Froia and the invasion of the Basques. He traveled to Rome, where he was sent to procure the part of Gregory's Morales missing in Spain. He received this work from Pope Martin I. He worked as a compiler of others’ works, and in a letter to Eugene II of Toledo, he explained the plan of his writing and its relationship to Gregory’s model.
During Froia's siege, Taius had been working at a revision of the Lex Visigothorum, unable to leave the city.
Taius wrote what has been regarded as a “poorly organized” book called Liber Sententiarum, which drew heavily upon the writings of Gregory and Saint Augustine. Sententiarum libri V (Five books of the sentences) is his only known work.
- "Caii, vel Taionis, Caesaraugustanae urbis episcopi, cognomento Saorohelis, vel Samuhelis [...] Sententiarum libri V, quibus praemittitur Epistola noncupatoria (Five Books of the Sentences)". World Digital Library (in Latin). Retrieved 2014-02-28.
- Léopold Delisle, Inventaire des manuscripts de la Bibliothèque nationale: Fonds de Cluny (H. Champion, 1884) (Digitized August 29, 2007) 111.
- Wilhelm Kohl (1996). "Taius". In Bautz, Traugott. Biographisch-Bibliographisches Kirchenlexikon (BBKL) (in German) 11. Herzberg: Bautz. cols. 431–433. ISBN 3-88309-064-6.]
- Collins, Visigothic Spain, 84.
- Joseph F. O'Callaghan, A History of Medieval Spain (Cornell University Press, 1975), 87
- "Five Books of the Sentences : Caii, vel Taionis, Caesaraugustanae urbis episcopi, cognomento Saorohelis, vel Samuhelis [...] Sententiarum libri V, quibus praemittitur Epistola noncupatoria". World Digital Library (in Latin). Retrieved 2014-02-28.
- Collins, Roger. Visigothic Spain, 409–711. Oxford: Blackwell Publishing, 2004. ISBN 0-631-18185-7.
- García Villada, Z. “Fragmentos inéditos de Tajón.” RABM 30 (1914), 23–31.
- Madoz, J. “Tajón de Zaragoza y su viaje a Roma.” Mélanges Joseph de Ghellink 1:345–60.
- Palacios Martín, A. “Tajón de Zaragoza y la ‘Explicatio in Cantica Canticorum.’” AEF 3 (1980) 115–27.
- Robles, L. “Tajón de Zaragoza, continuador de Isidoro.” Saitabi 21 (1971), 19–25.
- Serratosa, R. “Osio de Córdoba. Tajón de Zaragoza.” Estudios 19 (1951), 85–95.
- Vega, A. C. “Tajón de Zaragoza. Una obra inédita.” CD 155 (1943) 145–77.
- Wilhelm Kohl (1996). "Taius". In Bautz, Traugott. Biographisch-Bibliographisches Kirchenlexikon (BBKL) (in German) 11. Herzberg: Bautz. cols. 431–433. ISBN 3-88309-064-6.
- España sagrada: Vol. 31 Ed. Enrique Florez. Madrid: 1770. Includes a reprint of the Sententiarum Libri V and associated material (pp 152–544).