What language were manuscripts written in?

Manuscripts were written in many different languages, depending on the time period, geographic location, and the intended audience. There's no single answer. Some examples include:

* Latin: Extremely common in Europe for many centuries, especially for religious texts and scholarly works.

* Greek (Ancient and Byzantine): Another significant language for classical and religious manuscripts.

* Arabic: Important for scientific, philosophical, and religious texts in the Islamic world.

* Sanskrit: Used for religious and literary works in India.

* Chinese: Used for a vast range of texts in China.

* Various vernacular languages: As time went on, manuscripts began to be written in many more local and regional languages, including Old English, Old French, Old High German, and many more.

To know the language of a specific manuscript, you need more information about its origin and context.