Simplify the following text for a Grade 7 native English-speaking person.
Original: The most widely accepted theory recognizes the cityâ s name as deriving from the Latin Via Regis ( `` Kings ' Road '' ) , the name of the Medieval road linking the fortification built on the beach to Lucca .
Simplified: The cityâ s name comes from the Latin `` via regis '' , the name of the Medieval road used for going to Lucca .