system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How did aristocrats prove their identity back in time?

Let's assume a Middle Ages king was in a foreign land and somebody stole his fancy dresses and stuff. How could he prove he was actually a king? And more specifically, how could he claim he was that certain guy?
gpt
* Seals and insignia, sometimes on rings. These were used to stamp official documents.
* Knowledge, like how most of European nobles knew Latin and could read.
* Nobles went to events and got to know each other.

If a noble got mugged in a strange land, they would be going to a local sympathetic noble or merchant. They wouldn't be heading to a local bar full of drunks to proclaim they were king.