It was "d. Ferdinand Magellan" who used his position in Portugal to promote seafaring expeditions Magellan was one of the most prominent explorers in history and is still cited in navigation tactics to this day.
Ferdinand Magellan was a Portuguese explorer widely recognized for performing the first circumnavigation of the Earth and for making the first expedition across the Atlantic Ocean to the Strait of Magellan and across the Pacific Ocean.
Checks and balances, principle of government under which separate branches are empowered to prevent actions by other branches and are induced to share power. Checks and balances are applied primarily in constitutional governments.
