Cyclopedia of Biblical, Theological and Ecclesiastical Literature
a Scotch prelate, was probably bishop of St. Andrews in the 12th century. See Keith. Scottish Bishops, page 9.
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McClintock, John. Strong, James. Entry for 'Walter (1)'. Cyclopedia of Biblical, Theological and Ecclesiastical Literature. https://www.studylight.org/encyclopedias/eng/tce/w/walter-1.html. Harper & Brothers. New York. 1870.