Life and Martyrdom
Sirmium, in the province of Pannonia, was a major city of the late Roman Empire situated on the River Sava. Irenaeus served there as bishop, having been a presbyter before his elevation, and the synaxarion remembers him as a man of education and ascetic discipline.
During the persecution under Diocletian and Maximian he was arrested on account of his preaching and brought before the official Probus, who demanded that he offer sacrifice to the pagan gods. Irenaeus refused to deny Christ and was subjected to torture. The account relates that his family, including his children, witnessed his suffering and begged him to recant; when urged to do so for his sons, he replied that his sons believed in God, who would care for them.
He was led onto the bridge over the River Sava, where he knelt and prayed for his flock before being beheaded. His body was then thrown into the river.