Francisco Álvares
The account of his journey, compiled as A True Relation of the Lands of Prester John of the Indies was published in Portugal by Luis Rodriguez.
Baldridge's monograph offers a detailed and engaging account of Friar Francisco's journey to Ethiopia along with rich discussion of the legend and the substantial role it played in the ideology, politics, and maritime activity of 16th century Portugal.
Baldridge (p. 16) introduces the journey thusly:
In the spring of 1520 he found himself aboard a ship of his nation preparing to disembark upon a beach in Ethiopia, a kingdom where he, and many other Europeans, believed that Prester John would at last be found alive.