"For the martyr of this name, see Saint Placidus (martyr).
Saint Placidus (also known as Saint Placid) was a disciple of Saint Benedict. He was the son ...
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of the patrician Tertullus, was brought as a child to St. Benedict at Sublaqueum (Subiaco) and dedicated to God as provided for in chapter 69 of the Rule of St. Benedict (oblate)." - (en.wikipedia.org 24.12.2020)