"15. [1] Lovanii (Leuven), apud Hieronymum VVellaeum, ad intersigne Diamantis, execudebat Ioannes Masius 1575 (colophon), 1577, in-8°, (16)nn pp (title with woodengraved printer's mark) + 432 pp + (48)nn pp . (complete). USTC 412655. [2] Lovanii (Leuven), apud Hieronymum VVellaeum, ad intersigne Diamantis, execudebat Ioannes Masius 1575 (colophon), 1575, in-8°, pp. 471(error=371) + (13)nn pp (of which three last - aa7v , aa8r, aa8v- are blank). (complete). USTC 406280. Bound in a somewhat later (17th c. French ?) binding, full calf, triple fillets on both covers, raised gilt spine, edges red spickeld, marbled endpapers. Nice copy although with some wear at extremities and with the upper joint broken. Without any provenance indication. Rare collection of two works by Pope St. Leo I ( the Great) who reigned from 440 - 4461. Together with St. Gregory I it is the only pope to have ''the Great'' added to his name. A first edition of his works was published in Rome by Ardicinio della Porta in 1470. These 2 works edited by theologians of Louvain University are rare. Title [1] lists only with 3 copies (Cambridge- two colleges ; Louvain); title [2] 4 copies (not in a Belgian library)."