World without End
by Kenn Follett
seen from the Rico Troncoso`s perspective

When the Black Death came to the town, they had to take precautions so that they did not die, precautions that they copied from Italy and Florence, despite not understanding their language, they observed that the measures worked

Only priests could be doctors since they were the only ones who could speak and understand Latin. They were considered the smartest people

Merthin main character traveled to Florence to learn about architecture in order to bring his knowledge back to his people and build great palaces and chapels. In addition he created a "Loom" to produce a type of space cloth which helped the growth of the town.

Only priests could speak Latin because they were considered the most intelligent people, although their medical practices were not effective.

In order to negotiate with the King at that time, it was necessary to know English, it was the only way to be able to negotiate taxes, purchases, sales; even a slave could negotiate his freedom if he did it in English

Slaves were people who knew and traveled a lot, because they changed owners. In the book Jobs a slave, he lived in 10 different villages throughout his life. Also I could speak 6 different languages including Latin although it was not allowed