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Bible Encyclopedias
Sigillum Altaris

Cyclopedia of Biblical, Theological and Ecclesiastical Literature

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(seal of the altar). "The authentic mark of an altar was its five crosses; and there was a small stone called sigillum altaris, by which the aperture for the insertion of relics was closed up by mortar tempered in holy water" (Fosbrooke).

Bibliography Information
McClintock, John. Strong, James. Entry for 'Sigillum Altaris'. Cyclopedia of Biblical, Theological and Ecclesiastical Literature. https://www.studylight.org/​encyclopedias/​eng/​tce/​s/sigillum-altaris.html. Harper & Brothers. New York. 1870.
 
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