A more thorough explanation:

adscripti glebae

Adscripti glebae refers to tenants or serfs who were tied to the land in Roman law. This means that if the land was sold or transferred, the serfs were also transferred along with it. They were not free to leave the land without permission from their owner.

• A farmer who lived on a piece of land and worked for the landowner was considered adscripti glebae. He could not leave the land without permission from the landowner.
• In ancient Rome, some people were born into a family of adscripti glebae and were bound to the land for their entire lives.

These examples illustrate how adscripti glebae were tied to the land and could not leave without permission. They were essentially owned by the landowner and were not free to move or work elsewhere.