Leuce (titular see)
Leuce had a bishop by at latest 381, when a Bishop Symeon of Leuce took part in the First Council of Constantinople. The Notitiae Episcopatuum of the 10th to the 13th centuries mention it among the suffragans of Philippopolis, the metropolitan see of Thracia, thus ruling out the identification of Leuce with today's Plovdiv in Bulgaria, although this identification has been proposed.
- Annuario Pontificio 2013 (Libreria Editrice Vaticana 2013 ISBN 978-88-209-9070-1), p. 917
- Sophrone Pétridès, "Leuce" in Catholic Encyclopedia (New York 1910)