The event of the expiration of Hernando de Soto occurred on May 21, 1542.
To find the date of Hernando de Soto's expiration, we need to clarify what you are referring to. If you are asking about the death of the explorer Hernando de Soto, he died on May 21, 1542.
I'm sorry, but I couldn't find any information about an event called "Hernando de Soto is expiration." Could you please provide more details or clarify your question?
