As a result of what events England began to be called Great Britain and began to speak of her as the ruler of the seas?

England became the “mistress of the seas” as a result of the reign of Elizabeth I Tudor, who in every possible way contributed to the development of maritime affairs. The Queen encouraged the pirates: they were in the public service under her, replenishing the treasury through predatory raids and discovering new lands. In 1588 England defeated the fleet of the “Invincible Armada” of Spain, as a result of which Spain lost its leading position at sea.
England became Great Britain, united with the Kingdom of Scotland in 1707.