(d. 688), abbot of Wearmouth. Nothing is known of his origins or early life, but in 686, while still a deacon, he was chosen to succeed Eosterwine, the first abbot of Wearmouth appointed by the founder Benedict Biscop to rule the community in his absence. Sigfrid was notable for his knowledge of Scripture, his temperance, and obedience. Unfortunately he also had a weak constitution and died of a lung disease after Benedict's return in 686, on 22 August, 688. Bede is the authority for this date: a cult at Wearmouth and Jarrow is certain, following Ceolfrith's translation of his relics.
From The Oxford Dictionary of Saints in Oxford Reference.