 Syagrius was son of Bishop (later Saint) Desideratus of Verdun, who was killed by Sirivald, for reasons of rivalry and revenge.Syagrius organized a punitive expedition in 554, to assassinate Sirivald in a villa, after murdering a first person by mistake, they returned to fulfil its mission.In 567, he participated in the Second Synod of Lyon, and 573 in the Third Synod of Paris convened by Guntram, and the Second Council of Mâcon in 581, and 583 in the Third Council of Lyons.