Madeira Captain-major

medieval map showing atlantic frontier , settlements along sea (petrus roselli) bibliothèque nationale de france

there 3 captaincies in archipelago of madeira, associated 3 principal discoverers of islands:

funchal, bestowed capitão donatário joão gonçalves zarco
machico, bestowed capitão donatário tristão vaz teixeira
porto santo, appointed capitão donatário bartolomeu perestrello