U Kaptolskome arhivu Splitsko-makarske nadbiskupije pod kataloškim brojem 463 nalazi se kodeks od pergamene pisan goticom. Popis arhivskoga gradiva bilješkom o signaturi dokazuje da je rukopis ranije bio poznat i, tom logikom, trebao je biti u slijedu knjiga i fascikli na određenomu mjestu, ali ga nije bilo. Kako to pri otkrićima obično biva, sasvim slučajno je ponovno pronađen koncem 2017. godine. Ispočetka se držalo da se radi o potpuno nepoznatomu srednjovjekovnome kodeksu. U veljači 2018. utvrdilo se da je pronađeni rukopis upravo onaj koji je otprije bio arhiviran u Katalogu pod brojem 463. Do otkrića je došlo tako da su - zajedno s rukopisom koji sadrži životopis sv. Klementa pape, iz 16. stoljeća - uočeni neki stariji dijelovi. Ti dijelovi po stilu pisma i podlozi na kojoj je pisano nisu mogli pripadati u izvorni rukopis o životopisu sv. Klementa nego su puno stariji. Primarnom analizom utvrdilo se da je riječ o srednjovjekovnomu liturgijskome kodeksu. Kodeks je restauriran i čeka uvezivanje u tvrde korice. Nakon restauratorskih zahvata napravili smo liturgijsku i kodikološku analizu koja je pomogla ispravnom uređenju slijeda folija u kodeksu. Rezultate potonjih analiza donosimo kao doprinose u nastavku.; In the Capitol Archive of the Split-Makarska Archdiocese, under code number 463, there is a manuscript, a parchment codex written in Gothic script. The list of archival data, with a signature note, proves that the manuscript was previously known, and logically it should have been placed among the books and folders, but was not. As it usually happens with discoveries, the manuscript was found by chance, in late 2017. It was thought to be a completely unknown medieval codex. In February 2018, it was determined that the manuscript is precisely the one that had been previously archived under code number 463. It was discovered together with the manuscript containing St. Clement's biography from the 16th century, and some older parts were noticed. These parts, considering their writing style and writing pad, could not belong to the original St. Clement's biography manuscript; they are much older. The primary analysis revealed that it was a medieval liturgical codex. The codex is restored and is now waiting to be hardbound. After restoration, liturgical and codicological analyses were carried out which contributed to the proper arrangement of the foil of the codex. The results of the latter analysis are provided below.