For 10 points, name this Portuguese prince who sent explorers as far as Sierra Leone and whose epithet reflects his interest in seafaring.
This governor of the Order of Christ, a spin-off of the Knights Templar, condemned his brother to captivity under Cala Ben Cala as part of a failed peace agreement. While in the service of this man, Gil Eanes became the first European to travel past Cape Bojador. This grandson of John of Gaunt began the Aviz dynasty, and though he never found Prester John, his expeditions from Lagos were so lucrative that he was able to mint his nation's first gold coin, the cruzado. For 10 points, name this Portuguese prince who sent explorers as far as Sierra Leone and whose epithet reflects his interest in seafaring.
This governor of the Order of Christ, a spin-off of the Knights Templar, condemned his brother to captivity under Cala Ben Cala as part of a failed peace agreement.
Prince {Henry} the {Navigator} [or {Henrique} o {Navegador}]