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In page Scriptio continua:

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Before and after the advent of the codex, Latin and Greek script was written on scrolls by slave scribes. The role of the scribes was to simply record everything they heard to create documentation. Because speech is continuous, there was no need to add spaces.[citation needed] Typically, the reader of the text was a trained performer, who would have already memorised the content and breaks of the script.[citation needed] During the reading performances, the scroll acted as a cue sheet and therefore did not require in-depth reading.[citation needed]