 Not much before year 1580 he designed, transcribed and illuminated "Law on Mines of Despotes Stefan Lazarević", a collection of medieval Serbian mining regulations.This was, in all probability, an order by local authorities of Kratovo, needed to renew their production according to the wants of the Ottoman administration.In this book Islamic influence is reflected in its elongated format, arabesque on its cover, narrow size of letters and, of course, in its vignettes.