The text is on a plaque at ground level near the stone.
Galicia is an autonomous region and former kingdom of N W Spain, on the Bay of Biscay and the Atlantic. If the results of a Google search are anything to go by, Saint-Jacques de Compostelle is still a significant site of pilgrimage today.
Site: Pilgrims (1 memorial)
1000, Porte de Hal, close to the tower