<P> Over a hundred years later , missionaries had more success , setting up posts along the river . Spanish Franciscan missionaries gave the river its current name based on San Juan del Puerto ( St. John of the Harbor ) , the mission established at the river 's mouth following the demise of the French fort . The name first appeared on a Spanish map created between 1680 and 1700 . </P>
<P> Over a hundred years later , missionaries had more success , setting up posts along the river . Spanish Franciscan missionaries gave the river its current name based on San Juan del Puerto ( St. John of the Harbor ) , the mission established at the river 's mouth following the demise of the French fort . The name first appeared on a Spanish map created between 1680 and 1700 . </P>
who is the st johns river named after
who is the st johns river named after
San Juan del Puerto ( St. John of the Harbor ) , the mission established at the river 's mouth following the demise of the French fort
San Juan del Puerto ( St. John of the Harbor ) , the mission established at the river 's mouth following the demise of the French fort