Saint Hesychius or Isicius (French: Isice; died c. 565) was a bishop of Vienne from about 545 to his death.
[1][2] According to the historian Bernard Bligny (1979), Hesychius belonged to "one of the principal Gallo-Roman families of 'Bourgogne', the Hesychii, a branch of the Syagrii", of whom several members were bishops of either Vienne and Grenoble.
[3] Archbishop Leger of Vienne recorded in his Liber Episcopalis Viennensis Ecclesiae (1060) that Hesychius took part in the Fifth Council of Orléans in 549 (noted as "Eutychius") and in the Council of Paris in 552.
He was buried by his sister Marcellina near the tomb of Saint Avitus.
[2][5][6] Hesychius' cultus as a saint was attested in the 15th-century calendar of Vienne[7] and was confirmed by Pope Pius X by decree dated 9 December 1903.