(Serbian Cyrillic: Октоих), in English the Book of Psalms or Psalter, is an incunabula printed in Cetinje, Montenegro in 1494. Oktoih is a book of liturgical hymns for singing in eight parts. It was printed in the Printing house of the Crnojevići by Đurađ IV Crnojević, an educated ruler of Zeta from 1490-1496. Two volumes from 1493 and 1494 are kept in the museum of the Serbian Orthodox Church in Sarajevo, Bosnia and Herzegovina.
The book is the first printed Old Church Slavonic and in general in Cyrillic book. The book had 5 volumes, of which two are known and were printed in Montenegro.
(The pic to the right is A page of Oktoih petoglasnik, printed at the Crnojevic printing house in Cetinje, 1494)
Oktoih, the fifth voice (Oktoih petoglasnik) represents the first illustrated South Slavic incunabula. It was printed in 1494. Its fragments have been preserved. The longest one contains 37 pages. What makes this incunabula special are six woodcut illustrations. The artist who made them managed to put rather complex compositions with many characters on a relatively small space.