Conversation so far:
What rewards did Vasco da Gama receive?
Vasco da Gama received the town of Sines as a hereditary fief in December 1499
What happened with the town of Sines after Vasco da Gama received it as a hereditary fief?
Vasco da Gama receiving Sines turned out to be a complicated affair, for the town still belonged to the Order of Santiago.

Question: What happened after that?
Self-contained rewrite: What happened after Vasco da Gama received Sines the town that still belonged to the Order of Santiago?