The Southport Gate bears the Royal Arms of Charles V , Holy Roman Emperor , as well as the coat of arms of Gibraltar .
It was constructed by Italian engineer Giovanni Battista Calvi in 1552 , under the reign of Charles V , Holy Roman Emperor .
The Southport Gate bears the Charles V                 , as well as the coat of arms of Gibraltar .
It was constructed by Italian engineer Giovanni Battista Calvi in 1552 , under the reign of Charles V , Holy Roman Emperor .