The Composer as Engraver
Engraving is a production step that went from the individual to the pros and is now creeping back to the responsibility of the composer.
Early-music composers had quite possibly the most difficult job: engrave each piece AND develop a system with which to notate. It wasn’t until around at least 800 that music began to be notated in any systematic way and it was a long time (about another 800 years) before the modern system became fairly well developed.
Around 1500, shortly after Gutenberg developed a movable type printing system, music engraving became the job of professionals. Notation was more or less becoming standardized and composers were more easily able to produce multiple copies of a piece of music by handing it over to an engraver.