Conversation so far:
What types of exploration happened before Vasco da Gama?
Exploration before Vasco da Gama included Portuguese expeditions organized by Prince Henry the Navigator had been reaching down the African coastline, principally in search of west African riches.
Were any riches found during the Portuguese expeditions organized by Prince Henry the Navigator had been reaching down the African coastline, principally in search of west African riches?
Portuguese expeditions organized by Prince Henry had greatly extended Portuguese maritime knowledge, but had little profit to show for the effort.
What happened after Henry's death in exploration before Vasco da Gama?
After Henry's death in 1460, the Portuguese Crown showed little interest in continuing this effort and, in 1469, licensed the neglected African enterprise to a private Lisbon merchant consortium
What was the result of neglection of the African enterprise with Vasco da Gama?
Within a few years of neglection of the African enterprise, captains expanded Portuguese knowledge across the Gulf of Guinea, doing business in gold dust, melegueta pepper, ivory and slaves.
What was the most profitable trade during exploration before Vasco da Gama?
Are there any other interesting aspects about this exploration before Vasco da Gama article aside from doing business in gold dust, melegueta pepper, ivory and sub-Saharan slaves?
upon becoming king, John II of Portugal set out on many long reforms. To break the monarch's dependence on the feudal nobility, he needed to build up the royal treasury
Who were some of John II of Portugal's trade partners in exploration before Vasco da Gama?
Under John II's watch, the gold and slave trade in west Africa was greatly expanded. He was eager to break into the highly profitable spice trade between Europe and Asia
Who headed the explorations before Vasco da Gama to break into the highly profitable spice trade between Europe and Asia?
Before Vasco da Gama, John II dispatched two spies, Pero da Covilhã and Afonso de Paiva, overland via Egypt to East Africa and India
Was John II successful in his exploration before Vasco da Gama to break into the highly profitable spice trade between Europe and Asia?
Breakthrough came soon after, when John II's captain Bartolomeu Dias returned from rounding the Cape of Good Hope having verified that the unknown coast stretched away to the northeast.

Question: What did the spies do?
Self-contained rewrite: What did the spies Pero da Covilhã and Afonso de Paiva, overland via Egypt to East Africa and India do in exploration before Vasco da Gama?