Por esto dieron las llaves de la ciudad de Fresno al mexicano Saul 'Canelo' Alvarez
Briefly

The tradition dates back to medieval times when cities were walled, and the key symbolized the recipient's freedom to come and go as they pleased.
The key to the city is often presented by the mayor or other city officials during special events, like the visit of a dignitary or commemorating a citizen's significant milestone.
Read at Sacramento Bee
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