Chancery folio (277 x 205 mm). Collation: I4; 2-218 2210. 173 leaves (of 174; lacking final blank). 33 lines. Roman type 3:112. Capital spaces with guide letters, illuminated with 2 6-line initials in blue with elaborate red penwork, numerous 2-line initials in blue. (First and last leaves inlaid, repairs to a few lower corner margins occasionally just touching a letter or two). 20th-century blind-stamped blue morocco by Vignal (upper cover detached, lower joint slightly rubbed, minor chipping to spine ends). 

FIRST EDITION IN ITALIAN of Leo I's sermons. The Bishop of Aleria's epistle, beginning on 1v, shows Corsini worked from the Latin edition of Sweynheym and Pannartz, published in 1470 in Rome, or one of its reprints (the present edition omitting a few miscellaneous pieces at the end).  BMC VI, 638; BSB-Ink L-104; HC 10016; Goff L-136.