What does it mean that the oyster bed was "the bed that raised the King of Spain to be a great power in Europe?" Why is this ironic? (The pearl).

The passage suggests that pearls taken from this oyster bed had enriched Spain, the nation that had colonized Kino's land ... It is ironic that the pearls from Kino's native village only bring wealth and power to a faraway king, not to the people who do the work of finding them.

Explanation: Just google it or something.