Lavanha was mathematical tutor to the prince. Lavanha dedicated a translation of Euclid to Philip in 1584. Later he presented the King with the manuscript of his Regimiento nautico, which he later dedicated to Philip in its published form. From this date served as chief engineer to Philip. This may be identical with the previous item from another.
Court See above.
Apparently a salary of 40,000 reales. At the same time he assumed the chair of mathematics in Lisbon at 20,000 reales. This chair was to teach mathematics to sailors and pilots and was thus not at a university. Lavanha was to inspect maps and instruments used in navigation, supervise the construction of astrolabes, quadrants, and compasses, and to examine aspiring pilots, cartographers, and instrument makers. He devised a new instrument for navigation himself.