Conversation so far:
why are the bricks in san juan blue
The cobblestones, called adoquines, were made as an ingenious use of the waste, or slag, that resulted from iron smelting.
what is the history of san juan
In 1508, Juan Ponce de León founded the original settlement, Caparra. In 1509, the settlement was abandoned and moved to a site which was called at the time Puerto Rico.

Question: when did the name get adde
Self-contained rewrite: when did the name san juan get added to puerto rico