* To find new sources of wealth. Asia was known to be a land of great wealth, and European rulers were eager to get their hands on some of it. They hoped to find new sources of spices, gold, silver, and other valuable commodities.
* To spread Christianity. The Renaissance was a time of renewed interest in classical learning and culture. This led to a renewed interest in Christianity, and many European rulers were eager to spread the faith to new parts of the world.
* To gain prestige. Finding a new route to Asia would be a major accomplishment, and it would bring great prestige to the ruler who achieved it. This was an important consideration for many European rulers, who were constantly competing for power and influence.