There are many reasons why people become knighted. In the olden days, it was usually due to outstanding acts, such as protecting the kingdom, owning land or having a significant role in the society.
Nowadays people become Lords (Sirs) in pretty much the same way; by performing outstanding acts of bravery, kindness, courage or strength!
Do something VERY valuable to the sitting government
A Lord was a powerful noble
Noble
Lord or earl
The answer is noble.
the vikings
A vassal
A vassal
To become a noble in medieval Europe, one typically needed to be born into a noble family, as nobility was largely hereditary. However, individuals could also gain noble status through acts of valor in battle, significant service to a king or lord, or by purchasing a title. In some cases, a monarch might grant nobility as a reward for loyalty or exceptional contributions to the realm. Additionally, marrying into a noble family could also elevate one's social standing.
A soldier could become a Noble, and a noble could become the emporer.
You can probably order them from The Noble Collection
Noble Collection sells them